Foreign characters result in errors and/or incorrect displayed characters.

[Azoraqua]

When the language files contain any form of foreign characters, it'll result in an InvalidConfigurationException (Because the YAML parser cannot parse it correctly) and/or displays square symbols.

This is almost certainly an encoding issue, at compile-time, and/or at run-time.

On a side-note, starting the server using the -Dfile.encoding=utf-8 might fix it; Might need to compile using UTF-8 explicitly.

[trafoziya]

On a side-note, starting the server using the -Dfile.encoding=utf-8 might fix it; Might need to compile using UTF-8 explicitly.

Nope, using the -Dfile.encoding=utf-8 does not fix that. 😢