Bug 968071 - Taken/Shoot date in image/video info not localizable

This approach let us reuse an existing string, so it can be ported to
1.3

Note that this also changes the en-US format from mm-dd-YYYY to
mm/dd/YYYY
Merge pull request #16071 from flodolo/bug968071_mediainfo

Bug 968071 - Taken/Shoot date in image/video info not localizable