DEV: Add count to missing translation strings (#15509)

…for easier debugging of i18n issues.

app/assets/javascripts/discourse/tests/unit/lib/i18n-test.js

@@ -122,7 +122,7 @@ module("Unit | Utility | i18n", function (hooks) {
     assert.strictEqual(
       I18n.t("hello.world"),
       "Hello World!",
-      "doesn't break if a key is overriden in a locale"
+      "doesn't break if a key is overridden in a locale"
     );
     assert.strictEqual(I18n.t("hello.universe"), "", "allows empty strings");
   });
@@ -215,6 +215,30 @@ module("Unit | Utility | i18n", function (hooks) {
     assert.strictEqual(I18n.t("word_count", { count: 100 }), "100 words");
   });
 
+  test("adds the count to the missing translation strings", function (assert) {
+    assert.strictEqual(
+      I18n.t("invalid_i18n_string", { count: 1 }),
+      `[fr.invalid_i18n_string count=1]`
+    );
+
+    assert.strictEqual(
+      I18n.t("character_count", { count: "0" }),
+      `[fr.character_count count="0"]`
+    );
+
+    assert.strictEqual(
+      I18n.t("character_count", { count: null }),
+      `[fr.character_count count=null]`
+    );
+
+    assert.strictEqual(
+      I18n.t("character_count", { count: undefined }),
+      `[fr.character_count count=undefined]`
+    );
+
+    assert.strictEqual(I18n.t("character_count"), "[fr.character_count]");
+  });
+
   test("fallback", function (assert) {
     assert.strictEqual(
       I18n.t("days", { count: 1 }),

app/assets/javascripts/locales/i18n.js

@@ -168,7 +168,7 @@ I18n.translate = function(scope, options) {
   try {
     return this.interpolate(translation, options);
   } catch (error) {
-    return this.missingTranslation(scope);
+    return this.missingTranslation(scope, null, options);
   }
 };
 
@@ -297,11 +297,17 @@ I18n.pluralize = function(translation, scope, options) {
   return this.missingTranslation(scope, keys[0]);
 };
 
-I18n.missingTranslation = function(scope, key) {
+I18n.missingTranslation = function(scope, key, options) {
   var message = "[" + this.currentLocale() + this.SEPARATOR + scope;
+
   if (key) {
     message += this.SEPARATOR + key;
   }
+
+  if (options && options.hasOwnProperty("count")) {
+    message += " count=" + JSON.stringify(options.count);
+  }
+
   return message + "]";
 };