FIX: Fix broken out of date themes admin notice (#27916)

The OutOfDateThemes problem check is using an old method of setting the message, by overriding #message. It should instead use #translation_keys. (By chance I noticed the same thing applies to UnreachableThemes.

app/models/problem_check.rb

@@ -169,12 +169,11 @@ class ProblemCheck
   def problem(override_key: nil, override_data: {})
     [
       Problem.new(
-        message ||
-          I18n.t(
-            override_key || translation_key,
-            base_path: Discourse.base_path,
-            **override_data.merge(translation_data).symbolize_keys,
-          ),
+        I18n.t(
+          override_key || translation_key,
+          base_path: Discourse.base_path,
+          **override_data.merge(translation_data).symbolize_keys,
+        ),
         priority: self.config.priority,
         identifier:,
       ),
@@ -185,10 +184,6 @@ class ProblemCheck
     []
   end
 
-  def message
-    nil
-  end
-
   def translation_key
     "dashboard.problem.#{identifier}"
   end

app/services/problem_check/out_of_date_themes.rb

@@ -11,19 +11,23 @@ class ProblemCheck::OutOfDateThemes < ProblemCheck
 
   private
 
+  def translation_data
+    { themes_list: }
+  end
+
   def out_of_date_themes
     @out_of_date_themes ||= RemoteTheme.out_of_date_themes
   end
 
-  def message
-    "#{I18n.t("dashboard.problem.out_of_date_themes")}<ul>#{themes_list}</ul>"
-  end
-
   def themes_list
-    out_of_date_themes
-      .map do |name, id|
-        "<li><a href=\"#{Discourse.base_path}/admin/customize/themes/#{id}\">#{CGI.escapeHTML(name)}</a></li>"
-      end
-      .join("\n")
+    <<~HTML.squish
+      <ul>#{
+      out_of_date_themes
+        .map do |name, id|
+          "<li><a href=\"#{Discourse.base_path}/admin/customize/themes/#{id}\">#{CGI.escapeHTML(name)}</a></li>"
+        end
+        .join("\n")
+    }</ul>
+    HTML
   end
 end

app/services/problem_check/unreachable_themes.rb

@@ -11,19 +11,23 @@ class ProblemCheck::UnreachableThemes < ProblemCheck
 
   private
 
+  def translation_data
+    { themes_list: }
+  end
+
   def unreachable_themes
     @unreachable_themes ||= RemoteTheme.unreachable_themes
   end
 
-  def message
-    "#{I18n.t("dashboard.problem.unreachable_themes")}<ul>#{themes_list}</ul>"
-  end
-
   def themes_list
-    unreachable_themes
-      .map do |name, id|
-        "<li><a href=\"/admin/customize/themes/#{id}\">#{CGI.escapeHTML(name)}</a></li>"
-      end
-      .join("\n")
+    <<~HTML.squish
+      <ul>#{
+      unreachable_themes
+        .map do |name, id|
+          "<li><a href=\"/admin/customize/themes/#{id}\">#{CGI.escapeHTML(name)}</a></li>"
+        end
+        .join("\n")
+    }</ul>
+    HTML
   end
 end

config/locales/server.en.yml

@@ -1668,8 +1668,8 @@ en:
       poll_pop3_timeout: "Connection to the POP3 server is timing out. Incoming email could not be retrieved. Please check your <a href='%{base_path}/admin/site_settings/category/email'>POP3 settings</a> and service provider."
       poll_pop3_auth_error: "Connection to the POP3 server is failing with an authentication error. Please check your <a href='%{base_path}/admin/site_settings/category/email'>POP3 settings</a>."
       force_https: "Your website is using SSL. But `<a href='%{base_path}/admin/site_settings/category/all_results?filter=force_https'>force_https</a>` is not yet enabled in your site settings."
-      out_of_date_themes: "Updates are available for the following themes:"
-      unreachable_themes: "We were unable to check for updates on the following themes:"
+      out_of_date_themes: "Updates are available for the following themes:%{themes_list}"
+      unreachable_themes: "We were unable to check for updates on the following themes:%{themes_list}"
       watched_words: "The regular expression for %{action} watched words is invalid. Please check your <a href='%{base_path}/admin/customize/watched_words'>Watched Word settings</a>, or disable the 'watched words regular expressions' site setting."
       google_analytics_version: "Your Discourse is currently using Google Analytics 3, which will no longer be supported after July 2023. <a href='https://meta.discourse.org/t/260498'>Upgrade to Google Analytics 4</a> now to continue receiving valuable insights and analytics for your website's performance."
       category_style_deprecated: "Your Discourse is currently using a deprecated category style which will be removed before the final beta release of Discourse 3.2. Please refer to <a href='https://meta.discourse.org/t/282441'>Moving to a Single Category Style Site Setting</a> for instructions on how to keep your selected category style."