Specify UTC Time Zone for feed card date strings
Specify UTC Time Zone for feed card date strings

This simple change fixes two feed card date string bugs:

1) Makes the featured article/image cards reflect the true UTC date their
   content is associated with, rather than the current local date (minus
   "age"), when the two differ.

2) Makes the most-read card date string reflect the correct date that its
   content is associated with (currently it shows as a day behind the true
   value).

Bug: T140712
Change-Id: I0bd35b93157ab905a5adbc5950ddc0cb19f4c590

wikimedia/apps-android-wikipedia,anirudh24seven/apps-android-wikipedia,anirudh24seven/apps-android-wikipedia,anirudh24seven/apps-android-wikipedia,dbrant/apps-android-wikipedia,SAGROUP2/apps-android-wikipedia,dbrant/apps-android-wikipedia,dbrant/apps-android-wikipedia,anirudh24seven/apps-android-wikipedia,wikimedia/apps-android-wikipedia,SAGROUP2/apps-android-wikipedia,dbrant/apps-android-wikipedia,SAGROUP2/apps-android-wikipedia,dbrant/apps-android-wikipedia,wikimedia/apps-android-wikipedia,wikimedia/apps-android-wikipedia,anirudh24seven/apps-android-wikipedia,SAGROUP2/apps-android-wikipedia,SAGROUP2/apps-android-wikipedia