Why do most of the forums appear to be non-english?
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My understanding is that localization determines what forums you see. I'm in California, playing on the NA server, yet my account seems to mostly be set to the german language forums.
How do I change the default to be the english forums?
I didn't notice any "default" language for my forums, but the reason that it looks like there are more foreign language forums is that English is only one language. "Foreign languages" actually includes quite a few non-English languages.