Moving some txt strings to Errors.language.php

Signed-off-by: Suki <suki@missallsunday.com>
Moves some txt errors to Errors.language.php

Signed-off-by: Suki <suki@missallsunday.com>
fixes #1527
thanks to @Akyhne for the report

Signed-off-by: Suki <suki@missallsunday.com>