Windows' preferred-language list is also the input-language list: a language
added for a keyboard sits in it, and taking the first entry with a catalog
turned the interface German on a Polish system (a German keyboard) while the
system and the other apps stayed Polish. Only the first preferred language now
decides; when it has no catalog the interface reads English. macOS'
AppleLanguages and gettext's `LANGUAGE` still take the first language with a
catalog. Fixes#291.
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