Well, I’m here. What do you want me to do?
“Vatten är ett farligt gift,
vilket omger Visby stift.” 
Hi, thanks for your interest in LanguageTool. If you’d like to improve support for Swedish, you can just start using LanguageTool and find what’s not working well yet, like false alarms and errors that LT doesn’t detect yet. What is your background, are you a developer?
A description on how to write error detection rules (that’s just one way to detect errors) can be found at Development Overview - LanguageTool Wiki
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Author, with some developer experience. Not java, though.
I’ll check your link. Thanks.