Lots of things need to be disallowed in the robtos.txt file for starters.
All the /forum/search urls, anythign to do with memberlist, login, etc.
Also your forum geenrates session ids - this is bad for robots, try to find
a way to suppress those, otherwise an unlimuited number of dsiticnt urls are
generated for all teh same page.
For the gallery also there are many uri prefixes that should be disallowed
in robtos.txt such as /webgalerija/index.php?lang and
/webgalerija/displayimage.php?album=random and
/webgalerija/thumbnails.php.
Think carefully all that results in useless pages, with no content or with
the same content as others and disallow thsoe.
As for GSiteCrawler, you will need to request it to reimport the new
robots.txt file and filter everything, before restarting the crawl.
Just merely setting filters in GSC itself does not help - Googlebto will
still encounter all those urls you are filtering in GSC.
Also ake sure you are not requesting GSC to include image files in the
sitemap - it's useless as images (and video/audio files) don't belong in a
general web sitemap. Only web pages and text containing files shoudl be
included..