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The problem is that if you start having a part of the forum in French, after, why not in Spanish, in swedish.... and in the end, people won't go on these because they don't see the point if everyone is on the english forum.
If a french speaking person can't understant english, he won't be able to get there anyway, unless there is a full french version of DB which is much more work.
In the end, if DB as so much succes, it is because it is in english and people all over the word can participate.
If the french forums are not as good yet, it is also because they have to start somewhere, I am sure DB was not so good at the very start...