WINTERMUTE: Add quite a bit of hackery to allow Reversion 1.3 to select languages properly.

Reversion 1.3 seems to have one language file in it’s main-folder, and
a full set in languages/ (not language/ like a few other games), the names
of the language-files are also different from what we’ve seen earlier.
WINTERMUTE: Add a fake detection entry for Czech Dead City.

The language data for the Czech version are in data.dcp, but the pairs
of {language.dcp, data.dcp} get preference over just a match on data.dcp,
thus we need to detect Czech as one of these pairs, giving the user the
choice of language on detection. In this case I just copied the english-detection.