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"rw", "or", "tt", "tk", and "ug" were launched by the Translate service
in March. Add those that are supported by l10n to the default Translate
supported languages list. Also update translate and l10n comment names
to match those in the Translate service.

Bug: 1150514
Change-Id: Ifd69d003c1f2b917af3ac57b2631a566c33f3853
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2561268Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Megan Jablonski <megjablon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834508}