Internationalize date format (#2685)

* Changed view_date helper to use datetime format from i18n

* Removed German translation for date format, should be added via
transifex

Co-authored-by: Henning Schumann <henning.schumann@unicode-it.de>
Co-authored-by: Ahmad Farhat <ahmad.af.farhat@gmail.com>

app/helpers/application_helper.rb

@@ -135,6 +135,6 @@ module ApplicationHelper
   # Returns a more friendly/readable date time object
   def view_date(date)
     return "" if date.nil? # Handle invalid dates
-    local_time(date, "%b %d, %Y %-I:%M%P")
+    local_time(date, :default)
   end
 end