Update preparation to current develop-ascraeus to remove the odd debug message

Laut Travis ist hier ein bisschen was schief gegangen, da fehlt ein _NUM:
Fatal in language/de/ucp.php:

Must contain key: 
> FIELD_INVALID_CHARS_LETTER_NUM_DOTS
FIELD_INVALID_CHARS_LETTER_NUM_ONLY
FIELD_INVALID_CHARS_LETTER_NUM_PUNCTUATION
FIELD_INVALID_CHARS_LETTER_NUM_SPACERS
FIELD_INVALID_CHARS_LETTER_NUM_UNDERSCORE

Must not contain key: 
> FIELD_INVALID_CHARS_LETTER_DOTS
FIELD_INVALID_CHARS_LETTER_ONLY
FIELD_INVALID_CHARS_LETTER_PUNCTUATION
FIELD_INVALID_CHARS_LETTER_SPACERS
FIELD_INVALID_CHARS_LETTER_UNDERSCORE