From 4541784a4f4847c19984523edd0b5bb47314b8ec Mon Sep 17 00:00:00 2001
From: Sergey Biryukov <sergeybiryukov.ru@gmail.com>
Date: Tue, 1 Dec 2020 18:07:08 +0000
Subject: [PATCH] Site Health, App Passwords: Ensure REST API responses are
 properly translated.

The REST API requests in Site Health and App Passwords now include `_locale=user` in the request URL to ensure the user's locale is used instead of the site locale. Additionally, the `apiRequest` library now sends a JSON `Accept` header which is required by `determine_locale()` to respect the `_locale` query parameter.

The Site Health REST API controllers now manually load the default admin textdomain if not `is_admin()`. This allows for the Site Health tests to be translated even though the translations are part of the administration project and the REST API is not.

Props oglekler, kebbet, Clorith, TimothyBlynJacobs, ocean90, SergeyBiryukov, adamsilverstein.
Reviewed by TimothyBlynJacobs, SergeyBiryukov.
Merges [49716] to the 5.6 branch.
Fixes #51871.
Built from https://develop.svn.wordpress.org/branches/5.6@49724


git-svn-id: http://core.svn.wordpress.org/branches/5.6@49447 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-admin/js/application-passwords.js          |  6 ++--
 wp-admin/js/application-passwords.min.js      |  2 +-
 wp-admin/js/auth-app.js                       |  2 +-
 wp-admin/js/auth-app.min.js                   |  2 +-
 wp-admin/js/site-health.js                    |  2 +-
 wp-admin/js/site-health.min.js                |  2 +-
 wp-includes/js/api-request.js                 | 34 +++++++++++++------
 wp-includes/js/api-request.min.js             |  2 +-
 .../class-wp-rest-site-health-controller.php  | 22 ++++++++++++
 wp-includes/script-loader.php                 |  2 +-
 wp-includes/version.php                       |  2 +-
 11 files changed, 56 insertions(+), 22 deletions(-)

diff --git a/wp-admin/js/application-passwords.js b/wp-admin/js/application-passwords.js
index 09e4434e2f..b1a20ceb8e 100644
--- a/wp-admin/js/application-passwords.js
+++ b/wp-admin/js/application-passwords.js
@@ -47,7 +47,7 @@
 		request = wp.hooks.applyFilters( 'wp_application_passwords_new_password_request', request, userId );
 
 		wp.apiRequest( {
-			path: '/wp/v2/users/' + userId + '/application-passwords',
+			path: '/wp/v2/users/' + userId + '/application-passwords?_locale=user',
 			method: 'POST',
 			data: request
 		} ).always( function() {
@@ -94,7 +94,7 @@
 		$submitButton.prop( 'disabled', true );
 
 		wp.apiRequest( {
-			path: '/wp/v2/users/' + userId + '/application-passwords/' + uuid,
+			path: '/wp/v2/users/' + userId + '/application-passwords/' + uuid + '?_locale=user',
 			method: 'DELETE'
 		} ).always( function() {
 			$submitButton.prop( 'disabled', false );
@@ -123,7 +123,7 @@
 		$submitButton.prop( 'disabled', true );
 
 		wp.apiRequest( {
-			path: '/wp/v2/users/' + userId + '/application-passwords',
+			path: '/wp/v2/users/' + userId + '/application-passwords?_locale=user',
 			method: 'DELETE'
 		} ).always( function() {
 			$submitButton.prop( 'disabled', false );
diff --git a/wp-admin/js/application-passwords.min.js b/wp-admin/js/application-passwords.min.js
index 0cef7eb19e..95389326ae 100644
--- a/wp-admin/js/application-passwords.min.js
+++ b/wp-admin/js/application-passwords.min.js
@@ -1,2 +1,2 @@
 /*! This file is auto-generated */
-!function(i){var a=i("#application-passwords-section"),o=a.find(".create-application-password"),n=o.find(".input"),t=o.find(".button"),p=a.find(".application-passwords-list-table-wrapper"),r=a.find("tbody"),d=r.find(".no-items"),e=i("#revoke-all-application-passwords"),l=wp.template("new-application-password"),c=wp.template("application-password-row"),w=i("#user_id").val();function u(e,s,a){var o=a;e.responseJSON&&e.responseJSON.message&&(o=e.responseJSON.message),f(o,"error")}function f(e,s){var a=i("<div></div>").attr("role","alert").attr("tabindex","-1").addClass("is-dismissible notice notice-"+s).append(i("<p></p>").text(e)).append(i("<button></button>").attr("type","button").addClass("notice-dismiss").append(i("<span></span>").addClass("screen-reader-text").text(wp.i18n.__("Dismiss this notice."))));return o.after(a),a}function v(){i(".notice",a).remove()}t.click(function(e){if(e.preventDefault(),!t.prop("aria-disabled")){var s=n.val();if(0!==s.length){v(),t.prop("aria-disabled",!0).addClass("disabled");var a={name:s};a=wp.hooks.applyFilters("wp_application_passwords_new_password_request",a,w),wp.apiRequest({path:"/wp/v2/users/"+w+"/application-passwords",method:"POST",data:a}).always(function(){t.removeProp("aria-disabled").removeClass("disabled")}).done(function(e){n.val(""),t.prop("disabled",!1),o.after(l({name:s,password:e.password})),i(".new-application-password-notice").focus(),r.prepend(c(e)),p.show(),d.remove(),wp.hooks.doAction("wp_application_passwords_created_password",e,a)}).fail(u)}else n.focus()}}),r.on("click",".delete",function(e){if(e.preventDefault(),window.confirm(wp.i18n.__("Are you sure you want to revoke this password? This action cannot be undone."))){var s=i(this),a=s.closest("tr"),o=a.data("uuid");v(),s.prop("disabled",!0),wp.apiRequest({path:"/wp/v2/users/"+w+"/application-passwords/"+o,method:"DELETE"}).always(function(){s.prop("disabled",!1)}).done(function(e){e.deleted&&(0===a.siblings().length&&p.hide(),a.remove(),f(wp.i18n.__("Application password revoked."),"success").focus())}).fail(u)}}),e.on("click",function(e){if(e.preventDefault(),window.confirm(wp.i18n.__("Are you sure you want to revoke all passwords? This action cannot be undone."))){var s=i(this);v(),s.prop("disabled",!0),wp.apiRequest({path:"/wp/v2/users/"+w+"/application-passwords",method:"DELETE"}).always(function(){s.prop("disabled",!1)}).done(function(e){e.deleted&&(r.children().remove(),a.children(".new-application-password").remove(),p.hide(),f(wp.i18n.__("All application passwords revoked."),"success").focus())}).fail(u)}}),a.on("click",".notice-dismiss",function(e){e.preventDefault();var s=i(this).parent();s.removeAttr("role"),s.fadeTo(100,0,function(){s.slideUp(100,function(){s.remove(),n.focus()})})}),0===r.children("tr").not(d).length&&p.hide()}(jQuery);
\ No newline at end of file
+!function(i){var a=i("#application-passwords-section"),o=a.find(".create-application-password"),n=o.find(".input"),t=o.find(".button"),p=a.find(".application-passwords-list-table-wrapper"),r=a.find("tbody"),d=r.find(".no-items"),e=i("#revoke-all-application-passwords"),l=wp.template("new-application-password"),c=wp.template("application-password-row"),u=i("#user_id").val();function w(e,s,a){var o=a;e.responseJSON&&e.responseJSON.message&&(o=e.responseJSON.message),f(o,"error")}function f(e,s){var a=i("<div></div>").attr("role","alert").attr("tabindex","-1").addClass("is-dismissible notice notice-"+s).append(i("<p></p>").text(e)).append(i("<button></button>").attr("type","button").addClass("notice-dismiss").append(i("<span></span>").addClass("screen-reader-text").text(wp.i18n.__("Dismiss this notice."))));return o.after(a),a}function v(){i(".notice",a).remove()}t.click(function(e){if(e.preventDefault(),!t.prop("aria-disabled")){var s=n.val();if(0!==s.length){v(),t.prop("aria-disabled",!0).addClass("disabled");var a={name:s};a=wp.hooks.applyFilters("wp_application_passwords_new_password_request",a,u),wp.apiRequest({path:"/wp/v2/users/"+u+"/application-passwords?_locale=user",method:"POST",data:a}).always(function(){t.removeProp("aria-disabled").removeClass("disabled")}).done(function(e){n.val(""),t.prop("disabled",!1),o.after(l({name:s,password:e.password})),i(".new-application-password-notice").focus(),r.prepend(c(e)),p.show(),d.remove(),wp.hooks.doAction("wp_application_passwords_created_password",e,a)}).fail(w)}else n.focus()}}),r.on("click",".delete",function(e){if(e.preventDefault(),window.confirm(wp.i18n.__("Are you sure you want to revoke this password? This action cannot be undone."))){var s=i(this),a=s.closest("tr"),o=a.data("uuid");v(),s.prop("disabled",!0),wp.apiRequest({path:"/wp/v2/users/"+u+"/application-passwords/"+o+"?_locale=user",method:"DELETE"}).always(function(){s.prop("disabled",!1)}).done(function(e){e.deleted&&(0===a.siblings().length&&p.hide(),a.remove(),f(wp.i18n.__("Application password revoked."),"success").focus())}).fail(w)}}),e.on("click",function(e){if(e.preventDefault(),window.confirm(wp.i18n.__("Are you sure you want to revoke all passwords? This action cannot be undone."))){var s=i(this);v(),s.prop("disabled",!0),wp.apiRequest({path:"/wp/v2/users/"+u+"/application-passwords?_locale=user",method:"DELETE"}).always(function(){s.prop("disabled",!1)}).done(function(e){e.deleted&&(r.children().remove(),a.children(".new-application-password").remove(),p.hide(),f(wp.i18n.__("All application passwords revoked."),"success").focus())}).fail(w)}}),a.on("click",".notice-dismiss",function(e){e.preventDefault();var s=i(this).parent();s.removeAttr("role"),s.fadeTo(100,0,function(){s.slideUp(100,function(){s.remove(),n.focus()})})}),0===r.children("tr").not(d).length&&p.hide()}(jQuery);
\ No newline at end of file
diff --git a/wp-admin/js/auth-app.js b/wp-admin/js/auth-app.js
index 4af3a05fa8..ad4403032d 100644
--- a/wp-admin/js/auth-app.js
+++ b/wp-admin/js/auth-app.js
@@ -54,7 +54,7 @@
 		request = wp.hooks.applyFilters( 'wp_application_passwords_approve_app_request', request, context );
 
 		wp.apiRequest( {
-			path: '/wp/v2/users/me/application-passwords',
+			path: '/wp/v2/users/me/application-passwords?_locale=user',
 			method: 'POST',
 			data: request
 		} ).done( function( response, textStatus, jqXHR ) {
diff --git a/wp-admin/js/auth-app.min.js b/wp-admin/js/auth-app.min.js
index cd2fd9dabe..6695f4dc1a 100644
--- a/wp-admin/js/auth-app.min.js
+++ b/wp-admin/js/auth-app.min.js
@@ -1,2 +1,2 @@
 /*! This file is auto-generated */
-!function(r,l){var p=r("#app_name"),i=r("#approve"),e=r("#reject"),d=p.closest("form"),o={userLogin:l.user_login,successUrl:l.success,rejectUrl:l.reject};i.click(function(e){var n=p.val(),a=r('input[name="app_id"]',d).val();if(e.preventDefault(),!i.prop("aria-disabled"))if(0!==n.length){i.prop("aria-disabled",!0).addClass("disabled");var s={name:n};0<a.length&&(s.app_id=a),s=wp.hooks.applyFilters("wp_application_passwords_approve_app_request",s,o),wp.apiRequest({path:"/wp/v2/users/me/application-passwords",method:"POST",data:s}).done(function(e,a,s){wp.hooks.doAction("wp_application_passwords_approve_app_request_success",e,a,s);var p,o,t,i=l.success;i?(p=i+(-1===i.indexOf("?")?"?":"&")+"site_url="+encodeURIComponent(l.site_url)+"&user_login="+encodeURIComponent(l.user_login)+"&password="+encodeURIComponent(e.password),window.location=p):(o=wp.i18n.sprintf('<label for="new-application-password-value">'+wp.i18n.__("Your new password for %s is:")+"</label>","<strong></strong>")+' <input id="new-application-password-value" type="text" class="code" readonly="readonly" value="" />',t=r("<div></div>").attr("role","alert").attr("tabindex",-1).addClass("notice notice-success notice-alt").append(r("<p></p>").addClass("application-password-display").html(o)).append("<p>"+wp.i18n.__("Be sure to save this in a safe location. You will not be able to retrieve it.")+"</p>"),r("strong",t).text(n),r("input",t).val(e.password),d.replaceWith(t),t.focus())}).fail(function(e,a,s){var p=s,o=null;e.responseJSON&&(o=e.responseJSON).message&&(p=o.message);var t=r("<div></div>").attr("role","alert").addClass("notice notice-error").append(r("<p></p>").text(p));r("h1").after(t),i.removeProp("aria-disabled",!1).removeClass("disabled"),wp.hooks.doAction("wp_application_passwords_approve_app_request_success",o,a,e)})}else p.focus()}),e.click(function(e){e.preventDefault(),wp.hooks.doAction("wp_application_passwords_reject_app",o),window.location=l.reject}),d.on("submit",function(e){e.preventDefault()})}(jQuery,authApp);
\ No newline at end of file
+!function(r,l){var o=r("#app_name"),i=r("#approve"),e=r("#reject"),d=o.closest("form"),p={userLogin:l.user_login,successUrl:l.success,rejectUrl:l.reject};i.click(function(e){var n=o.val(),a=r('input[name="app_id"]',d).val();if(e.preventDefault(),!i.prop("aria-disabled"))if(0!==n.length){i.prop("aria-disabled",!0).addClass("disabled");var s={name:n};0<a.length&&(s.app_id=a),s=wp.hooks.applyFilters("wp_application_passwords_approve_app_request",s,p),wp.apiRequest({path:"/wp/v2/users/me/application-passwords?_locale=user",method:"POST",data:s}).done(function(e,a,s){wp.hooks.doAction("wp_application_passwords_approve_app_request_success",e,a,s);var o,p,t,i=l.success;i?(o=i+(-1===i.indexOf("?")?"?":"&")+"site_url="+encodeURIComponent(l.site_url)+"&user_login="+encodeURIComponent(l.user_login)+"&password="+encodeURIComponent(e.password),window.location=o):(p=wp.i18n.sprintf('<label for="new-application-password-value">'+wp.i18n.__("Your new password for %s is:")+"</label>","<strong></strong>")+' <input id="new-application-password-value" type="text" class="code" readonly="readonly" value="" />',t=r("<div></div>").attr("role","alert").attr("tabindex",-1).addClass("notice notice-success notice-alt").append(r("<p></p>").addClass("application-password-display").html(p)).append("<p>"+wp.i18n.__("Be sure to save this in a safe location. You will not be able to retrieve it.")+"</p>"),r("strong",t).text(n),r("input",t).val(e.password),d.replaceWith(t),t.focus())}).fail(function(e,a,s){var o=s,p=null;e.responseJSON&&(p=e.responseJSON).message&&(o=p.message);var t=r("<div></div>").attr("role","alert").addClass("notice notice-error").append(r("<p></p>").text(o));r("h1").after(t),i.removeProp("aria-disabled",!1).removeClass("disabled"),wp.hooks.doAction("wp_application_passwords_approve_app_request_success",p,a,e)})}else o.focus()}),e.click(function(e){e.preventDefault(),wp.hooks.doAction("wp_application_passwords_reject_app",p),window.location=l.reject}),d.on("submit",function(e){e.preventDefault()})}(jQuery,authApp);
\ No newline at end of file
diff --git a/wp-admin/js/site-health.js b/wp-admin/js/site-health.js
index d91b75e90a..9bba750094 100644
--- a/wp-admin/js/site-health.js
+++ b/wp-admin/js/site-health.js
@@ -271,7 +271,7 @@ jQuery( document ).ready( function( $ ) {
 
 				if ( 'undefined' !== typeof( this.has_rest ) && this.has_rest ) {
 					wp.apiRequest( {
-						url: this.test,
+						url: wp.url.addQueryArgs( this.test, { _locale: 'user' } ),
 						headers: this.headers
 					} )
 						.done( function( response ) {
diff --git a/wp-admin/js/site-health.min.js b/wp-admin/js/site-health.min.js
index 18295a79da..cc617fedb5 100644
--- a/wp-admin/js/site-health.min.js
+++ b/wp-admin/js/site-health.min.js
@@ -1,2 +1,2 @@
 /*! This file is auto-generated */
-jQuery(document).ready(function(c){var a,t,s,h=wp.i18n.__,n=wp.i18n._n,o=wp.i18n.sprintf,i=new ClipboardJS(".site-health-copy-buttons .copy-button"),d=c(".health-check-body.health-check-debug-tab").length,r=c("#health-check-accordion-block-wp-paths-sizes");function l(e){var t,s,a=wp.template("health-check-issue"),i=c("#health-check-issues-"+e.status);if(!function(e){var t,s,a,i,n={test:"string",label:"string",description:"string"},o=!0;if("object"!=typeof e)return!1;for(t in n)if("object"==typeof(s=n[t]))for(a in s)i=s[a],void 0!==e[t]&&void 0!==e[t][a]&&i===typeof e[t][a]||(o=!1);else void 0!==e[t]&&s===typeof e[t]||(o=!1);return o}(e))return!1;SiteHealth.site_status.issues[e.status]++,s=SiteHealth.site_status.issues[e.status],void 0===e.test&&(e.test=e.status+s),"critical"===e.status?t=o(n("%s critical issue","%s critical issues",s),'<span class="issue-count">'+s+"</span>"):"recommended"===e.status?t=o(n("%s recommended improvement","%s recommended improvements",s),'<span class="issue-count">'+s+"</span>"):"good"===e.status&&(t=o(n("%s item with no issues detected","%s items with no issues detected",s),'<span class="issue-count">'+s+"</span>")),t&&c(".site-health-issue-count-title",i).html(t),c(".issues","#health-check-issues-"+e.status).append(a(e))}function u(){var e,t,s=c(".site-health-progress"),a=s.closest(".site-health-progress-wrapper"),i=c(".site-health-progress-label",a),n=c(".site-health-progress svg #bar"),o=parseInt(SiteHealth.site_status.issues.good,0)+parseInt(SiteHealth.site_status.issues.recommended,0)+1.5*parseInt(SiteHealth.site_status.issues.critical,0),r=.5*parseInt(SiteHealth.site_status.issues.recommended,0)+1.5*parseInt(SiteHealth.site_status.issues.critical,0),l=100-Math.ceil(r/o*100);0!==o?(a.removeClass("loading"),e=n.attr("r"),l<0&&(l=0),100<l&&(l=100),t=(100-l)/100*(Math.PI*(2*e)),n.css({strokeDashoffset:t}),parseInt(SiteHealth.site_status.issues.critical,0)<1&&c("#health-check-issues-critical").addClass("hidden"),parseInt(SiteHealth.site_status.issues.recommended,0)<1&&c("#health-check-issues-recommended").addClass("hidden"),80<=l&&0===parseInt(SiteHealth.site_status.issues.critical,0)?(a.addClass("green").removeClass("orange"),i.text(h("Good")),wp.a11y.speak(h("All site health tests have finished running. Your site is looking good, and the results are now available on the page."))):(a.addClass("orange").removeClass("green"),i.text(h("Should be improved")),wp.a11y.speak(h("All site health tests have finished running. There are items that should be addressed, and the results are now available on the page."))),d||(c.post(ajaxurl,{action:"health-check-site-status-result",_wpnonce:SiteHealth.nonce.site_status_result,counts:SiteHealth.site_status.issues}),100===l&&(c(".site-status-all-clear").removeClass("hide"),c(".site-status-has-issues").addClass("hide")))):s.addClass("hidden")}function p(e,t){var s;s={status:"recommended",label:h("A test is unavailable"),badge:{color:"red",label:h("Unavailable")},description:"<p>"+e+"</p><p>"+t+"</p>",actions:""},l(wp.hooks.applyFilters("site_status_test_result",s))}i.on("success",function(e){var t=c(e.trigger),s=c(".success",t.closest("div"));e.clearSelection(),t.focus(),clearTimeout(a),s.removeClass("hidden"),a=setTimeout(function(){s.addClass("hidden"),i.clipboardAction.fakeElem&&i.clipboardAction.removeFake&&i.clipboardAction.removeFake()},3e3),wp.a11y.speak(h("Site information has been copied to your clipboard."))}),c(".health-check-accordion").on("click",".health-check-accordion-trigger",function(){"true"===c(this).attr("aria-expanded")?(c(this).attr("aria-expanded","false"),c("#"+c(this).attr("aria-controls")).attr("hidden",!0)):(c(this).attr("aria-expanded","true"),c("#"+c(this).attr("aria-controls")).attr("hidden",!1))}),c(".site-health-view-passed").on("click",function(){var e=c("#health-check-issues-good");e.toggleClass("hidden"),c(this).attr("aria-expanded",!e.hasClass("hidden"))}),"undefined"==typeof SiteHealth||d||(0===SiteHealth.site_status.direct.length&&0===SiteHealth.site_status.async.length?u():SiteHealth.site_status.issues={good:0,recommended:0,critical:0},0<SiteHealth.site_status.direct.length&&c.each(SiteHealth.site_status.direct,function(){l(this)}),0<SiteHealth.site_status.async.length?function t(){var s=!0;1<=SiteHealth.site_status.async.length&&c.each(SiteHealth.site_status.async,function(){var e={action:"health-check-"+this.test.replace("_","-"),_wpnonce:SiteHealth.nonce.site_status};return!!this.completed||(s=!1,this.completed=!0,void 0!==this.has_rest&&this.has_rest?wp.apiRequest({url:this.test,headers:this.headers}).done(function(e){l(wp.hooks.applyFilters("site_status_test_result",e))}).fail(function(e){var t;t=void 0!==e.responseJSON&&void 0!==e.responseJSON.message?e.responseJSON.message:h("No details available"),p(this.url,t)}).always(function(){t()}):c.post(ajaxurl,e).done(function(e){l(wp.hooks.applyFilters("site_status_test_result",e.data))}).fail(function(e){var t;t=void 0!==e.responseJSON&&void 0!==e.responseJSON.message?e.responseJSON.message:h("No details available"),p(this.url,t)}).always(function(){t()}),!1)}),s&&u()}():u()),d&&(r.length?(t=(new Date).getTime(),s=window.setTimeout(function(){wp.a11y.speak(h("Please wait..."))},3e3),wp.apiRequest({path:"/wp-site-health/v1/directory-sizes"}).done(function(e){!function(i){var e=c("button.button.copy-button"),a=e.attr("data-clipboard-text");c.each(i,function(e,t){var s=t.debug||t.size;void 0!==s&&(a=a.replace(e+": loading...",e+": "+s))}),e.attr("data-clipboard-text",a),r.find("td[class]").each(function(e,t){var s=c(t),a=s.attr("class");i.hasOwnProperty(a)&&i[a].size&&s.text(i[a].size)})}(e||{})}).always(function(){var e=(new Date).getTime()-t;c(".health-check-wp-paths-sizes.spinner").css("visibility","hidden"),u(),3e3<e?(e=6e3<e?0:6500-e,window.setTimeout(function(){wp.a11y.speak(h("All site health tests have finished running."))},e)):window.clearTimeout(s),c(document).trigger("site-health-info-dirsizes-done")})):u())});
\ No newline at end of file
+jQuery(document).ready(function(c){var a,t,s,h=wp.i18n.__,n=wp.i18n._n,o=wp.i18n.sprintf,i=new ClipboardJS(".site-health-copy-buttons .copy-button"),d=c(".health-check-body.health-check-debug-tab").length,r=c("#health-check-accordion-block-wp-paths-sizes");function l(e){var t,s,a=wp.template("health-check-issue"),i=c("#health-check-issues-"+e.status);if(!function(e){var t,s,a,i,n={test:"string",label:"string",description:"string"},o=!0;if("object"!=typeof e)return!1;for(t in n)if("object"==typeof(s=n[t]))for(a in s)i=s[a],void 0!==e[t]&&void 0!==e[t][a]&&i===typeof e[t][a]||(o=!1);else void 0!==e[t]&&s===typeof e[t]||(o=!1);return o}(e))return!1;SiteHealth.site_status.issues[e.status]++,s=SiteHealth.site_status.issues[e.status],void 0===e.test&&(e.test=e.status+s),"critical"===e.status?t=o(n("%s critical issue","%s critical issues",s),'<span class="issue-count">'+s+"</span>"):"recommended"===e.status?t=o(n("%s recommended improvement","%s recommended improvements",s),'<span class="issue-count">'+s+"</span>"):"good"===e.status&&(t=o(n("%s item with no issues detected","%s items with no issues detected",s),'<span class="issue-count">'+s+"</span>")),t&&c(".site-health-issue-count-title",i).html(t),c(".issues","#health-check-issues-"+e.status).append(a(e))}function u(){var e,t,s=c(".site-health-progress"),a=s.closest(".site-health-progress-wrapper"),i=c(".site-health-progress-label",a),n=c(".site-health-progress svg #bar"),o=parseInt(SiteHealth.site_status.issues.good,0)+parseInt(SiteHealth.site_status.issues.recommended,0)+1.5*parseInt(SiteHealth.site_status.issues.critical,0),r=.5*parseInt(SiteHealth.site_status.issues.recommended,0)+1.5*parseInt(SiteHealth.site_status.issues.critical,0),l=100-Math.ceil(r/o*100);0!==o?(a.removeClass("loading"),e=n.attr("r"),l<0&&(l=0),100<l&&(l=100),t=(100-l)/100*(Math.PI*(2*e)),n.css({strokeDashoffset:t}),parseInt(SiteHealth.site_status.issues.critical,0)<1&&c("#health-check-issues-critical").addClass("hidden"),parseInt(SiteHealth.site_status.issues.recommended,0)<1&&c("#health-check-issues-recommended").addClass("hidden"),80<=l&&0===parseInt(SiteHealth.site_status.issues.critical,0)?(a.addClass("green").removeClass("orange"),i.text(h("Good")),wp.a11y.speak(h("All site health tests have finished running. Your site is looking good, and the results are now available on the page."))):(a.addClass("orange").removeClass("green"),i.text(h("Should be improved")),wp.a11y.speak(h("All site health tests have finished running. There are items that should be addressed, and the results are now available on the page."))),d||(c.post(ajaxurl,{action:"health-check-site-status-result",_wpnonce:SiteHealth.nonce.site_status_result,counts:SiteHealth.site_status.issues}),100===l&&(c(".site-status-all-clear").removeClass("hide"),c(".site-status-has-issues").addClass("hide")))):s.addClass("hidden")}function p(e,t){var s;s={status:"recommended",label:h("A test is unavailable"),badge:{color:"red",label:h("Unavailable")},description:"<p>"+e+"</p><p>"+t+"</p>",actions:""},l(wp.hooks.applyFilters("site_status_test_result",s))}i.on("success",function(e){var t=c(e.trigger),s=c(".success",t.closest("div"));e.clearSelection(),t.focus(),clearTimeout(a),s.removeClass("hidden"),a=setTimeout(function(){s.addClass("hidden"),i.clipboardAction.fakeElem&&i.clipboardAction.removeFake&&i.clipboardAction.removeFake()},3e3),wp.a11y.speak(h("Site information has been copied to your clipboard."))}),c(".health-check-accordion").on("click",".health-check-accordion-trigger",function(){"true"===c(this).attr("aria-expanded")?(c(this).attr("aria-expanded","false"),c("#"+c(this).attr("aria-controls")).attr("hidden",!0)):(c(this).attr("aria-expanded","true"),c("#"+c(this).attr("aria-controls")).attr("hidden",!1))}),c(".site-health-view-passed").on("click",function(){var e=c("#health-check-issues-good");e.toggleClass("hidden"),c(this).attr("aria-expanded",!e.hasClass("hidden"))}),"undefined"==typeof SiteHealth||d||(0===SiteHealth.site_status.direct.length&&0===SiteHealth.site_status.async.length?u():SiteHealth.site_status.issues={good:0,recommended:0,critical:0},0<SiteHealth.site_status.direct.length&&c.each(SiteHealth.site_status.direct,function(){l(this)}),0<SiteHealth.site_status.async.length?function t(){var s=!0;1<=SiteHealth.site_status.async.length&&c.each(SiteHealth.site_status.async,function(){var e={action:"health-check-"+this.test.replace("_","-"),_wpnonce:SiteHealth.nonce.site_status};return!!this.completed||(s=!1,this.completed=!0,void 0!==this.has_rest&&this.has_rest?wp.apiRequest({url:wp.url.addQueryArgs(this.test,{_locale:"user"}),headers:this.headers}).done(function(e){l(wp.hooks.applyFilters("site_status_test_result",e))}).fail(function(e){var t;t=void 0!==e.responseJSON&&void 0!==e.responseJSON.message?e.responseJSON.message:h("No details available"),p(this.url,t)}).always(function(){t()}):c.post(ajaxurl,e).done(function(e){l(wp.hooks.applyFilters("site_status_test_result",e.data))}).fail(function(e){var t;t=void 0!==e.responseJSON&&void 0!==e.responseJSON.message?e.responseJSON.message:h("No details available"),p(this.url,t)}).always(function(){t()}),!1)}),s&&u()}():u()),d&&(r.length?(t=(new Date).getTime(),s=window.setTimeout(function(){wp.a11y.speak(h("Please wait..."))},3e3),wp.apiRequest({path:"/wp-site-health/v1/directory-sizes"}).done(function(e){!function(i){var e=c("button.button.copy-button"),a=e.attr("data-clipboard-text");c.each(i,function(e,t){var s=t.debug||t.size;void 0!==s&&(a=a.replace(e+": loading...",e+": "+s))}),e.attr("data-clipboard-text",a),r.find("td[class]").each(function(e,t){var s=c(t),a=s.attr("class");i.hasOwnProperty(a)&&i[a].size&&s.text(i[a].size)})}(e||{})}).always(function(){var e=(new Date).getTime()-t;c(".health-check-wp-paths-sizes.spinner").css("visibility","hidden"),u(),3e3<e?(e=6e3<e?0:6500-e,window.setTimeout(function(){wp.a11y.speak(h("All site health tests have finished running."))},e)):window.clearTimeout(s),c(document).trigger("site-health-info-dirsizes-done")})):u())});
\ No newline at end of file
diff --git a/wp-includes/js/api-request.js b/wp-includes/js/api-request.js
index 885e5b47f8..58ef531179 100644
--- a/wp-includes/js/api-request.js
+++ b/wp-includes/js/api-request.js
@@ -10,6 +10,7 @@
  *
  * @since 4.9.0
  * @since 5.6.0 Added overriding of the "PUT" and "DELETE" methods with "POST".
+ *              Added an "application/json" Accept header to all requests.
  * @output wp-includes/js/api-request.js
  */
 
@@ -26,7 +27,7 @@
 		var path = options.path;
 		var method = options.method;
 		var namespaceTrimmed, endpointTrimmed, apiRoot;
-		var headers, addNonceHeader, headerName;
+		var headers, addNonceHeader, addAcceptHeader, headerName;
 
 		if (
 			typeof options.namespace === 'string' &&
@@ -55,19 +56,24 @@
 
 		// If ?_wpnonce=... is present, no need to add a nonce header.
 		addNonceHeader = ! ( options.data && options.data._wpnonce );
+		addAcceptHeader = true;
 
 		headers = options.headers || {};
 
-		// If an 'X-WP-Nonce' header (or any case-insensitive variation
-		// thereof) was specified, no need to add a nonce header.
-		if ( addNonceHeader ) {
-			for ( headerName in headers ) {
-				if ( headers.hasOwnProperty( headerName ) ) {
-					if ( headerName.toLowerCase() === 'x-wp-nonce' ) {
-						addNonceHeader = false;
-						break;
-					}
-				}
+		for ( headerName in headers ) {
+			if ( ! headers.hasOwnProperty( headerName ) ) {
+				continue;
+			}
+
+			// If an 'X-WP-Nonce' or 'Accept' header (or any case-insensitive variation
+			// thereof) was specified, no need to add the header again.
+			switch ( headerName.toLowerCase() ) {
+				case 'x-wp-nonce':
+					addNonceHeader = false;
+					break;
+				case 'accept':
+					addAcceptHeader = false;
+					break;
 			}
 		}
 
@@ -78,6 +84,12 @@
 			}, headers );
 		}
 
+		if ( addAcceptHeader ) {
+			headers = $.extend( {
+				'Accept': 'application/json, */*;q=0.1'
+			}, headers );
+		}
+
 		if ( typeof method === 'string' ) {
 			method = method.toUpperCase();
 
diff --git a/wp-includes/js/api-request.min.js b/wp-includes/js/api-request.min.js
index 63b9c9c2fe..2aedb9567e 100644
--- a/wp-includes/js/api-request.min.js
+++ b/wp-includes/js/api-request.min.js
@@ -1,2 +1,2 @@
 /*! This file is auto-generated */
-!function(w){var c=window.wpApiSettings;function n(e){return e=n.buildAjaxOptions(e),n.transport(e)}n.buildAjaxOptions=function(e){var n,t,o,r,p,a,i=e.url,d=e.path,s=e.method;if("string"==typeof e.namespace&&"string"==typeof e.endpoint&&(n=e.namespace.replace(/^\/|\/$/g,""),d=(t=e.endpoint.replace(/^\//,""))?n+"/"+t:n),"string"==typeof d&&(o=c.root,d=d.replace(/^\//,""),"string"==typeof o&&-1!==o.indexOf("?")&&(d=d.replace("?","&")),i=o+d),p=!(e.data&&e.data._wpnonce),r=e.headers||{},p)for(a in r)if(r.hasOwnProperty(a)&&"x-wp-nonce"===a.toLowerCase()){p=!1;break}return p&&(r=w.extend({"X-WP-Nonce":c.nonce},r)),"string"==typeof s&&("PUT"!==(s=s.toUpperCase())&&"DELETE"!==s||(r=w.extend({"X-HTTP-Method-Override":s},r),s="POST")),delete(e=w.extend({},e,{headers:r,url:i,method:s})).path,delete e.namespace,delete e.endpoint,e},n.transport=w.ajax,window.wp=window.wp||{},window.wp.apiRequest=n}(jQuery);
\ No newline at end of file
+!function(w){var l=window.wpApiSettings;function t(e){return e=t.buildAjaxOptions(e),t.transport(e)}t.buildAjaxOptions=function(e){var t,n,a,p,o,r,i,d=e.url,s=e.path,c=e.method;for(i in"string"==typeof e.namespace&&"string"==typeof e.endpoint&&(t=e.namespace.replace(/^\/|\/$/g,""),s=(n=e.endpoint.replace(/^\//,""))?t+"/"+n:t),"string"==typeof s&&(a=l.root,s=s.replace(/^\//,""),"string"==typeof a&&-1!==a.indexOf("?")&&(s=s.replace("?","&")),d=a+s),o=!(e.data&&e.data._wpnonce),r=!0,p=e.headers||{})if(p.hasOwnProperty(i))switch(i.toLowerCase()){case"x-wp-nonce":o=!1;break;case"accept":r=!1}return o&&(p=w.extend({"X-WP-Nonce":l.nonce},p)),r&&(p=w.extend({Accept:"application/json, */*;q=0.1"},p)),"string"==typeof c&&("PUT"!==(c=c.toUpperCase())&&"DELETE"!==c||(p=w.extend({"X-HTTP-Method-Override":c},p),c="POST")),delete(e=w.extend({},e,{headers:p,url:d,method:c})).path,delete e.namespace,delete e.endpoint,e},t.transport=w.ajax,window.wp=window.wp||{},window.wp.apiRequest=t}(jQuery);
\ No newline at end of file
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-site-health-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-site-health-controller.php
index 6dbc239ec0..f790dadb04 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-site-health-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-site-health-controller.php
@@ -171,6 +171,7 @@ class WP_REST_Site_Health_Controller extends WP_REST_Controller {
 	 * @return array
 	 */
 	public function test_background_updates() {
+		$this->load_admin_textdomain();
 		return $this->site_health->get_test_background_updates();
 	}
 
@@ -182,6 +183,7 @@ class WP_REST_Site_Health_Controller extends WP_REST_Controller {
 	 * @return array
 	 */
 	public function test_dotorg_communication() {
+		$this->load_admin_textdomain();
 		return $this->site_health->get_test_dotorg_communication();
 	}
 
@@ -193,6 +195,7 @@ class WP_REST_Site_Health_Controller extends WP_REST_Controller {
 	 * @return array
 	 */
 	public function test_loopback_requests() {
+		$this->load_admin_textdomain();
 		return $this->site_health->get_test_loopback_requests();
 	}
 
@@ -204,6 +207,7 @@ class WP_REST_Site_Health_Controller extends WP_REST_Controller {
 	 * @return array
 	 */
 	public function test_authorization_header() {
+		$this->load_admin_textdomain();
 		return $this->site_health->get_test_authorization_header();
 	}
 
@@ -219,6 +223,8 @@ class WP_REST_Site_Health_Controller extends WP_REST_Controller {
 			require_once ABSPATH . 'wp-admin/includes/class-wp-debug-data.php';
 		}
 
+		$this->load_admin_textdomain();
+
 		$sizes_data = WP_Debug_Data::get_sizes();
 		$all_sizes  = array( 'raw' => 0 );
 
@@ -256,6 +262,22 @@ class WP_REST_Site_Health_Controller extends WP_REST_Controller {
 		return $all_sizes;
 	}
 
+	/**
+	 * Loads the admin textdomain for Site Health tests.
+	 *
+	 * The {@see WP_Site_Health} class is defined in WP-Admin, while the REST API operates in a front-end context.
+	 * This means that the translations for Site Health won't be loaded by default in {@see load_default_textdomain()}.
+	 *
+	 * @since 5.6.0
+	 */
+	protected function load_admin_textdomain() {
+		// Accounts for inner REST API requests in the admin.
+		if ( ! is_admin() ) {
+			$locale = determine_locale();
+			load_textdomain( 'default', WP_LANG_DIR . "/admin-$locale.mo" );
+		}
+	}
+
 	/**
 	 * Gets the schema for each site health test.
 	 *
diff --git a/wp-includes/script-loader.php b/wp-includes/script-loader.php
index f3ad2de05c..a0da5a0c4d 100644
--- a/wp-includes/script-loader.php
+++ b/wp-includes/script-loader.php
@@ -1286,7 +1286,7 @@ function wp_default_scripts( $scripts ) {
 		$scripts->add( 'plugin-install', "/wp-admin/js/plugin-install$suffix.js", array( 'jquery', 'jquery-ui-core', 'thickbox' ), false, 1 );
 		$scripts->set_translations( 'plugin-install' );
 
-		$scripts->add( 'site-health', "/wp-admin/js/site-health$suffix.js", array( 'clipboard', 'jquery', 'wp-util', 'wp-a11y', 'wp-api-request' ), false, 1 );
+		$scripts->add( 'site-health', "/wp-admin/js/site-health$suffix.js", array( 'clipboard', 'jquery', 'wp-util', 'wp-a11y', 'wp-api-request', 'wp-url' ), false, 1 );
 		$scripts->set_translations( 'site-health' );
 
 		$scripts->add( 'privacy-tools', "/wp-admin/js/privacy-tools$suffix.js", array( 'jquery', 'wp-a11y' ), false, 1 );
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 91327d94ff..2a52dcc206 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.6-RC1-49723';
+$wp_version = '5.6-RC1-49724';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.