People's desire and ability to speak English vary greatly depending on their social class, native language, employment sector, age, etc. Excluding the people who happen to have poor English is very undemocratic.
We are talking about software here. This means English. Democracy has nothing to do wit this. it's just history. For ballet you need French, for medicine you need Latin and for software you need English—or else trying to create community is pretty hard (look on things like Nginx or Ruby: they only become big when they finally accepted this fact).
This may be "undemocratic" and "unfair" but that's life.
And if you need to write all the documents (or at least all the important ones) in English anyway then using English license is not such a big problem.
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