fi (Finnish), fr (French), sk (Slovak), sl (Slovenian), sr (Serbian)
and sv (Swedish). Remark: there are 2 families of aspell_* recipes:
those which have aspell6- in their SOURCE_{URI,DIR} (e.g. fi, sk, sr)
and the others, which don't have the 6 in aspell- (e.g. fr, sl, sv).