Anope complains in the logfile about being unable to load the default language.

You forgot to run "make install".

Anope spricht kein Deutsch!, etc. (Anope doesn't speak my language!)

See section 5 of the README file.

I selected a language other than English, but sometimes Anope sends responses in English instead.

Some language files are not complete--in other words, they don't have a translation of every message Anope uses,

but only some of them. In this case, the missing messages will be displayed in English. You can either wait for the primary

translator to provide us with a translation, or do the translation yourself and send us the messages translated into your language.