Run tools/normalize-po-files.sh on all *.po files to make sure they reflect the curre...

Run tools/normalize-po-files.sh on all *.po files to make sure they reflect the current messages.pot file. Some were very outdated. Note that ru.po for the levels (world1, world2, bonus1, bonus2) give fatal errors (duplicate messages). That file was thus not changed, but ru.po will need to be fixed for things to work.

git-svn-id: http://supertux.lethargik.org/svn/supertux/trunk/supertux@6462 837edb03-e0f3-0310-88ca-d4d4e8b29345