Update pl.properties

New lines, use Polish diacritic letters, few corrections
Merge pull request #145 from bulkazmaslem/patch-1

Update pl.properties
Merge pull request #144 from kankri/master

Make subscription errors visible and avoid a NPE if the public URL is not set
Update pl.properties

Finish polish translation, hopefully without errors.
Merge pull request #146 from bulkazmaslem/patch-2

Update pl.properties
recover password (wip)
pubsubhubbub support is now optional
more on password recovery
close tag
remove warning
settings for heavy load
make sure emails are unique
fix for feeds that do not declare the rss namespace at the root element, only the rdf one (#140)
retrive description for rss0.9 items (fixes #39)
delay based on heavy load setting
remove duplicate email title
small tweak to pubsubhubbub
small tweak to pubsubhubbub
Translated new labels

Improved a few earlier translations, translated all new text.
Merge pull request #147 from LpSamuelm/patch-2

Translated new labels