pronto-spell does not work with characters other than a - z

[alexanderadam]

Characters from other language alphabets will turn into wrong results (i.e. Gebühr will fail because ).
I guess it is because in the regexp ([A-Z]{0,1}[a-z]+) are used instead of ([[:upper:]]{0,1}[[:lower:]]+) (or \w or [[:alnum:]] or [[:alpha:]] or \p{L} or [\u\l]+).