We have some 'rules' written about that, see viewtopic.php?f=1&t=15787
So the question is, is nordicB.org a subtitle creating community, or 'just' a web site collecting subtitles from all over the internet?
That would make the difference between the URL being allowed or forbidden.
Besides that (and that is my personal opinion, not a 'rule'), I think credits shouldn't be too intrusive and in proportion.
For example, not immediately a split second after the last line of spoken text. Not seventeen times all over the place. Not two minutes of animated colored text.
Instead, for example when the end credits (of the movie) start, synced with sound and/or view.
In this case, without going into what nordicB.org really is (too lazy to sign up for an account), I see before the two modest seconds for the translator 5,5 seconds of 'screaming' for some web site. To me, this looks at least a bit disproportional.