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
Merge branch 'master' of https://github.com/frostwire/frostwire-android into patch-1

Conflicts:
	res/values-hr/strings.xml