Allow windows+de in addition to windows_de
I see lines like "windows_en" and "windows_de" in recent gettor commits. Great.
At the same time, we get mail to tor-assistants with lines like "tor-browser-bundle+fa". They're confused, since you're supposed to mail gettor+fa to specify your language. But even so, we should accept + as well as _ for the language specifier.
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