New answers tagged localization
For Samsung devices (unbranded ones) the answers are pretty simple: As long as the model is the same (exactly the same, even the characters after the numbers), the ROM is compatible. (Usually the bare models without any special characters after them have more international firmwares). Yes, it's enough if you flash an international/regional firmware on top ...
So I reflashed a different version of the ROM manually using ClockWorkMod (I used the Cyanogenmod application on Windows before) and now it works. Unfortunately don't know the version numbers, so was either a ROM issue or an issue in the Cyanogenmod Windows application.
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