[Q] How to replace the dictionary in Nook Simple Touch?

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Do you have any ideas how to replace EN-EN dictionary with EN-PL dictionary?

Yes, there is a whole thread on the subject of this.
You might want to start at the end because the earlier stuff is outdated.
http://forum.xda-developers.com/show...477918&page=25

The basic problem is finding a good public domain source,
converting it into TEI-XML format, converting that to our format,
then generating indexes on the Nook.

Yow! I see that freedict.org just changed how they do everything.
I'll have to investigate.