Extended delete and reset commands, various improvements and updated translations

New:

• The /aach delete and /aach reset commands now support * to delete all a player's achievements or statistics (e.g. /aach delete * DarkPyves).

Improvements:

• Dependency updates, minor performance improvements and code cleanups.
• The reset-successful parameter in lang.yml now supports a CAT placeholder for the category name. The name was previously preprended to the text.

Bug fix:

• Daily backups for SQLite and H2 databases (DatabaseBackup parameter) work again.

Translations:

• Updated German translation, thanks to @enterih for his contribution!
• Updated Chinese translation, thanks to @BillZhucn for his contribution!
• Updated Polish translation, thanks to @kacperleague9 for his contribution!