Polish localization (strings, formatter, tests)
Sorting out potential copyright issues - fixes #134
No Designers for the resx files
Polish as part of Czech & Slovak formatter.
Added PR to the release notes
Merge github.com:mnowacki/Humanizer into polish
formatting release notes entry
Merge branch 'polish'
releasing v1.18.1
added lib blurbs to license file for ByteSize
add russian translation for time spans
add russian translation for now
Cleaned up license headers
Merge pull request #139 from MehdiK/licensing-issues

Sorting out potential copyright issues - fixes #134
add PR to release notes
add russian translation for future dates
Merge pull request #143 from mexx/ru-timespan

add russian translation for time spans
Danish translation
Add pull request to release notes
Fixed language code, spelling errors

Was using the wrong language code and fixed some spelling errors.
Changes text in TimeSpanWithPrecesion test.