Hi, LanguageTool 5.9 has been released and can now be downloaded from here. It includes rule updates for Catalan, Dutch, English, German, French, Polish, Portuguese, Russian, Spanish, and Ukrainian.
It is not yet available through the LibreOffice/OpenOffice extension manager because I’d like to wait for feedback from people who install it manually.
All known bugs are solved. I am in discussion with some power user / developer about changing some wording and usability of the “LT spell and grammar check” dialog. But these changes should be left to V6.0