Fixes #2528 - Manage -> Calendars -> Edit: "Subscribe to public holidays in" sorted wrong

app/assets/javascripts/app/controllers/_ui_element/ical_feed.coffee

@@ -3,7 +3,9 @@ class App.UiElement.ical_feed extends App.UiElement.ApplicationUiElement
   @render: (attribute, params) ->
 
     icalFeeds           = App.Config.get('ical_feeds') || {}
-    icalFeedsSorted = App.Utils.sortByValue(icalFeeds)
+    icalFeedsTranslated = _.mapObject icalFeeds, (value, key) -> App.i18n.translateContent(value)
+    icalFeedsSorted     = App.Utils.sortByValue(icalFeedsTranslated)
+
     item = $( App.view('generic/ical_feed')( attribute: attribute, icalFeeds: icalFeedsSorted ) )
 
     updateCheckList = ->

app/assets/javascripts/app/lib/app_post/utils.coffee

@@ -1008,7 +1008,10 @@ class App.Utils
       valueTmp = value.toString().toLowerCase()
       byNames.push valueTmp
       byNamesWithValue[valueTmp] = [i, value]
-    byNames = byNames.sort()
+    
+    # sort() by default doesn't compare non-ascii characters such as ['é', 'a', 'ú', 'c']
+    # hence using localecompare in sorting for translated strings
+    byNames = byNames.sort((a, b) -> a.localeCompare(b))
 
     # do a reverse, if needed
     if order == 'DESC'

spec/system/manage/calendars_spec.rb

@@ -46,4 +46,26 @@ RSpec.describe 'Manage > Calendars', type: :system do
       end
     end
   end
+
+  # https://github.com/zammad/zammad/issues/2528
+  context 'ical feed - subscribe to public holidays in another country' do
+    it 'shows countries dropdown in sorted order' do
+      allow(Calendar).to receive(:ical_feeds).and_return({
+                                                           'https://argentinien.de':  'Argentinien',
+                                                           'https://australien.de':   'Australien',
+                                                           'https://osterreich.de':   'Österreich',
+                                                           'https://weibrussland.de': 'Weißrussland',
+                                                           'https://kanada.de':       'Kanada',
+                                                           'https://chile.de':        'Chile',
+                                                         })
+
+      visit '/#manage/calendars'
+
+      click '.js-new'
+
+      in_modal disappears: false do
+        expect(all('.ical_feed select option').map(&:text)).to eq ['-', 'Argentinien', 'Australien', 'Chile', 'Kanada', 'Österreich', 'Weißrussland']
+      end
+    end
+  end
 end