Polish translation corrections

Corrected bad looking grammar and logic mistakes

More polish fixes
More Croatian translations

Update strings.xml
Merge pull request #102 from darthxjanus/patch-1

More Croatian translations
Merge pull request #101 from kjanku1/master

Polish translation fixes
Update strings.xml
Merge pull request #104 from win32re/patch-3

Update strings.xml
Merge branch 'master' into swig3
Xml error.
Merge branch 'master' into swig3