As mentioned, please provide a translation with any posts as the forums are international but still relying on English for a better moderation/comprehension.
What staff are you referring to ? Certainly not Scirra, and as far as I'm aware, this is not sanctioned nor officially supported.
Will it be easy to get the translation over several releases or will have users to stay on a specific release because it is the only one translated ?
If the latter, than although I understand and appreciate the effort, it is in vain and will cause a lot of issues in the long run (bugs not fixed, features not available, etc...).
If the translation can be version independent, perhaps it could be a good idea, although in the long run, the official documentation is still in English too.
Warning, for anyone commenting further in this topic and not talking in or providing an English translation, your messages will simply be deleted.