-Update from WebTranslator v3.0:
polish - 10 changes by Kilian
slovak - 9 changes by Milsa


git-svn-id: http://svn.openttd.org/trunk@26687 6aa0318a-3be1-0310-93fa-89fd2396df07
-Fix: WT3 validation


git-svn-id: http://svn.openttd.org/trunk@26688 6aa0318a-3be1-0310-93fa-89fd2396df07