Merge commit '40ba6e119b7457161fd43b449875d0fb9d473c1a' into glitch-soc/merge-upstream

Conflicts:
- `app/controllers/concerns/web_app_controller_concern.rb`:
  Upstream changed the order of Action Controller filters for web app
  controllers.
  Glitch-soc has an extra filter due to its theming system.
  Changed the order accordingly.
- `app/views/settings/preferences/appearance/show.html.haml`:
  Conflict due to an extra newline in glitch-soc.
  Removed that newline and applied upstream's changes.

app/helpers/languages_helper.rb

@@ -230,6 +230,24 @@ module LanguagesHelper
     'sr-Latn': 'Srpski (latinica)',
   }.freeze
 
+  # Helper for self.sorted_locale_keys
+  private_class_method def self.locale_name_for_sorting(locale)
+    if locale.blank? || locale == 'und'
+      '000'
+    elsif (supported_locale = SUPPORTED_LOCALES[locale.to_sym])
+      ASCIIFolding.new.fold(supported_locale[1]).downcase
+    elsif (regional_locale = REGIONAL_LOCALE_NAMES[locale.to_sym])
+      ASCIIFolding.new.fold(regional_locale).downcase
+    else
+      locale
+    end
+  end
+
+  # Sort locales by native name for dropdown menus
+  def self.sorted_locale_keys(locale_keys)
+    locale_keys.sort_by { |key, _| locale_name_for_sorting(key) }
+  end
+
   def native_locale_name(locale)
     if locale.blank? || locale == 'und'
       I18n.t('generic.none')

app/helpers/settings_helper.rb

@@ -2,7 +2,11 @@
 
 module SettingsHelper
   def filterable_languages
-    LanguagesHelper::SUPPORTED_LOCALES.keys
+    LanguagesHelper.sorted_locale_keys(LanguagesHelper::SUPPORTED_LOCALES.keys)
+  end
+
+  def ui_languages
+    LanguagesHelper.sorted_locale_keys(I18n.available_locales)
   end
 
   def session_device_icon(session)