Review of supported languages
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Fragment of a discussion from Talk:Languages by language family
If you wrote to the registered translators of these languages you would have covered most of the contributors - I have spotted very few translators who weren't registered for these languages. Also, a list of past contributors will miss the registered translators who haven't contributed at all, of which there are quite a few. However, if some of these languages have had imports of messages, then I am not sure how to identify the person making the imports.