- fixed chat messages duping
- chat messages are marked read

git-svn-id: http://svn.miranda-ng.org/main/trunk@7610 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
Langpack Polish: update

git-svn-id: http://svn.miranda-ng.org/main/trunk@7611 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c