Polish translation update. Thanks Mar!

Here's the second part of my translation, hoping it will be usefull.
In a spare time I'll try to do some more. :)
Add HTML elements to ElementInfo from HTMLNode rather than maintaining a separate list, and hence fix CSS not recognising iframe as an element.
Include the redirects in tmpSize before deciding whether to include subdirs.
Guesstimate maximum size used by subdir before including it, hence don't go over the limit. Fixes some big site inserts.
1435, mandatory on the 14th of March (due to probe stats)
Merge branch 'master' into next