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"*,und" means: If the audio language is anything (English is excluded), use any subtitles language (English has already been excluded). "*,eng" means: If the audio is any language (except English since that's already been excluded) and English subtitles are available, use English subtitles. "eng,off" means: If the audio language is English, subtitles should not be displayed.
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They are interpreted in that order, so the first one that "matches" is used. There are three pairs in your configuration, "eng,off", "*,eng" and "*,und". This setting consists of pairs of audio and subtitle languages, and how to handle them.
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