Updated polish translation
Merge branch 'dev' of github.com:skibbipl/wallabag into skibbipl-dev

Conflicts:
	locale/pl_PL.utf8/LC_MESSAGES/pl_PL.utf8.mo
	locale/pl_PL.utf8/LC_MESSAGES/pl_PL.utf8.po
Merge branch 'skibbipl-dev' into dev