Spelling option for Polish language. Zip file provided in the forums by Zerivael Azza. Dictionary license:
This dictionary for spell-checking Polish texts is licensed under
GPL, LGPL, MPL (Mozilla Public License) and Creative Commons
ShareAlike licenses (see http://creativecommons.org/licenses/sa/1.0).
This version of the dictionary was generated on 2011-09-02
The most up-to-date version can be found at:
Dictionary maintainer: Marek Futrega (email@example.com)
As Spark is now under Apache license, maybe dictionaries also has to be licensed this way? Not sure. I think other dicts are also mostly GPL.
zip file should be placed into src\plugins\spelling\src\resources\dictionary and on the next build it should contain Polish language as the option in the Preferences.