Since the update, I always get the same error message when I try to translate a topic from another Language & Geographical Communities with Firefox.
And although I have selected “English” as Interface language, it translates this page into German for me.
I moved this into its own topic as I think it’s unrelated with the other issue.
I usually don’t use Firefox, but I just tried its translation of a topic and had no issue. Are you using Firefox built-in translation (which it appears to be in beta), or some browser extension?
And what URL does the browser show when it shows that error page?
Edit:
I have just had various Wikipedia pages in different languages translated into German - they all work perfectly. The Community Guidelines, for example, are also translated without any problems. So it only seems to not work in the forum,
This URL is at a different website (notice the domain is community-postcrossing-com.translate.goog). When I tried the Firefox translation, it translated the page in place, without going to a different website. I’m using
Can you double check that on Firefox installed add-ons you don’t have something related with google translate?
The reason I ask this is because the trouble may be on said add-on (if it’s the case you have one installed). The URL you were taken too has the bit /t/translation-in-firefox/864608/2 repeated in the URL – removing one of them makes it work. No idea why it’s appearing duplicate.
After some more poking, it doesn’t seem to be dependent on a particular add-on or even on Firefox, but on some weird interaction between Google Translate and Discourse.