Added backup locale lists to locale not available page

app/views/application/locale_not_available.html.haml

@@ -1,13 +1,13 @@
-= render :partial => 'application/header', :locals => {:image_file => 'runes.jpg'}
+= render partial: 'application/header', locals: {image_file: 'runes.jpg'}
 = row do
-	= columns(medium: 12) do
+  = columns(medium: 12) do
-		%p= _'error.locale_not_available.description', :p, @main_title_vars
+    %p= _'error.locale_not_available.description', :p, @main_title_vars
-		%ul.locales
+    %ul.locales
-			- @alt_lang_urls.each do |locale, url|
+      - (@alt_lang_urls || I18n.backend.enabled_locales.sort || [:en]).each do |locale, url|
-				%li
+        %li
-					- locale_translation = language_name(locale, true)
+          - locale_translation = language_name(locale, true)
-					%a.button{href: url, lang: locale}
+          %a.button{href: url, lang: locale}
-						=_'translate.content.change_locale', "Read in #{locale_translation}", vars: {language: locale_translation}, locale: locale
+            =_'translate.content.change_locale', "Read in #{locale_translation}", vars: {language: locale_translation}, locale: locale
-		%h2= _'error.locale_not_available.volunteer.title'
+    %h2= _'error.locale_not_available.volunteer.title'
-		%p= _'error.locale_not_available.volunteer.description'
+    %p= _'error.locale_not_available.volunteer.description'
-		= render 'contact', cancel_btn: false, contact_reason: :website, locale: :en
+    = render 'contact', cancel_btn: false, contact_reason: :website, locale: :en