Remove un-needed edge case sort condition in languages helper (#31724)

app/helpers/languages_helper.rb

@@ -238,9 +238,7 @@ module LanguagesHelper
 
   # 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])
+    if (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