hey horst,
from the pics it looks as these are from the notifications area, right?
if so then whatever changes you make in the language file will have no effect. in the current 1.1 version the notification strings are stored in the database (very bad...) so that updates to the language are only visible for new entries.
this should be also fixed in 1.2 so right now we have to count the days until 1.2 with a proper language handling will be available.
hope that helps