Hello,
in the hope I got it coded well, I added a few missing calls of wfMsg in the SpecialWatchlist.php function wlCutoffLinks() and the appropriates phrases in Language.php and LanguageDe.php.
This code is not tested, because I still not have running a proper test-wiki, but I hope the number of errors in 3 lines is not to high. Possibly one of our main coders can look over it.
Greetings Smurf