Sigil onlu uses utf-8 encoding. Any epub not using that encoding is converted to utf-8 on import. It sounds as if either the html file output by LibreOffice is encoded in latin-1 and marked as utf-8, or the user does not have a proper utf-8 font supporting the Polish characters.
Please try directly importing the html file into Sigil while *not* using the plugin. Once loaded, do you see the proper Polish chars or not in CodeView? If not, then the oroblem is with your system and Sigil and not his plugin.
You can also try using Sigil Preferences to set a font that has the proper utf-8 glyphs for Polish.
KevinH
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