Adding short date format i18n strings to Language message files

For the short date format 'Month XX', different languages are inconsistent about
whether they apply the genitive case. For example, in Czech using the genitive
form is correct. For German it's not. Because of this inconsistancy, we have to
have a separate set of i18n messages for this date format.

Bug: 47211
Change-Id: Idca1bfc9f4eff7dc561253424f15c15ea007ab6d
Merge "Adding short date format i18n strings to Language message files"