I can confirm that both solutions: Language=pl_PL.UTF-8 or Language=pl_PL.utf8 work for me. My system locale is set to "pl_PL.utf8". But still, this should be detected automatically if "Language" option is not specified in the "kdmrc" file.
I can confirm that both solutions: pl_PL.UTF- 8
Language=
or
Language=pl_PL.utf8
work for me. My system locale is set to "pl_PL.utf8". But still, this should be detected automatically if "Language" option is not specified in the "kdmrc" file.