The word diversity in that context means “avoiding the irrational discriminations present in the culture.”
Having different sections for each language would not promote inclusion but rather promote marginalization.
In my opinion, two distinct things can happen:
1)all posts are translated into all languages, and at this point there would be more translators than programmers on this site;
2) the non-English sections would be less frequented, people writing in their own language would receive fewer answers (of lower quality because fewer people check if the answers are correct) and people who also speak English would write their questions in English for this reason, making the non-English sections even less frequented.
If point 2 were to happen, it would create a marginalized situation exactly as it happens in cities where foreigners stay in the suburbs. This is not a good thing.
Having said that, learning English related to programming is not a difficult thing, I’m learning it by watching subtitled lessons on youtube.
This post was generated with an automatic translator, I didn’t write a single word in English.