please backport iceowl-extension, calendar-google-provider & l10n packages

[Johannes Rohr <jorohr@gmail.com>]

It is nice that icedove is being backported (although not the latest
version yet), but I suppose that it is not a rare case that it is
installed together with  iceowl-extension (Lightning) and
calendar-google-provider. Since the version dependency is strict,
wouldn't it be possible to have these backported as well? And what is
also missing, both for iceweasel and icedove, are the l10n packages. I
suppose backporting these should require little effort..

Thanks,

Johannes