Ingo has emailed the people who have offered translations.
You can see progress at http://translate.silverstripe.com ...
We've moved the forum!
Please use forum.silverstripe.org for any new questions
(announcement).
The forum archive will stick around, but will be read only.
You can also use our Slack channel
or StackOverflow to ask for help.
Check out our community overview for more options to contribute.
I can help with German translation! In 2.2.0-rc2 there are plenty items that are not translated.
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If you're keen to translate SilverStripe into another language and don't have an account yet, then apply at:
http://translate.silverstripe.com/apply
You can see http://translate.silverstripe.com/ to see the status of existing translations.