Update main/res/values-pl/strings.xml

Polish translation finished. I was comparing with current version of English string.xml.
refactoring: visit cache activity cleanup

* use alert dialogs instead of context menus
* simplify update logic
Merge remote-tracking branch 'mieczyslaw/master'
fix some translation errors
#2383: minor cleanup after merge
Remove empty loop accidentally entered when cleaning up
Merge pull request #2384 from campbeb/extraLoop

Remove empty loop accidentally entered when cleaning up
fix #2367: more intelligent initial logtype
fix #2385: relative links in OC caches lead to crash