Add the latest localized text strings, update scripts to support them.

There are lots of new and changed files here, but they're mostly localized
text strings and prerendered bitmaps of them.

There are a few that still need rendering by hand. These locales don't work
with ImageMagick:

  ar el fa hi iw ja ko th vi zh-CN zh-TW

Change-Id: I1777f985460d46d5aedbb3fbc2fd3c159439c454

Review URL:
605 files changed