Just put one and get the feedback, if there's one.
Maybe LazPaint need their own website, or at least a forum (maybe sourceforge has some forum that you can add to your current website in sourceforge - I say something like the 7zip forum), a feedback button in LazPaint that points to some feedback page. No one 'end user' will come to a programming site (I've seen only one or two in all LazPaint time..).
I've never received feedback about my translation
Also my e-mail is not in the translated file (please don't add it
(well, I can decide it of course), it's better for me but not for the feedback) also there's nothing in the about dialog (some programs put the info to contact the translator by email or translator website - and mostly they're broken
by time passing).
BTW mantain a forum is an incredible experience both as tedious. I held forums from more than six years, and there comes a time when it is best to give it to someone else
that's the best to add it on sourceforge, not so easy to give it away (?)