To reproduce:
- Set your accept-language to Polish
- Enable the CX beta feature in https://no.wikipedia.org/wiki/Spesial:Innstillinger#mw-prefsection-betafeatures
- Go to https://no.wikipedia.org/wiki/Vi_skal_ikkje_sova_bort_sumarnatta
- Click the gray "polski" interlanguage link, and click the button to start translating.
Observed:
- The target link is https://pl.wikipedia.org/wiki/Special:ContentTranslation?page=Vi+skal+ikkje+sova+bort+sumarnatta&from=nb&to=pl&campaign=interlanguagelink . It should be https://pl.wikipedia.org/wiki/Special:ContentTranslation?page=Vi+skal+ikkje+sova+bort+sumarnatta&from=no&to=pl&campaign=interlanguagelink . The difference is in the "no" parameter.
- More importantly, the source article cannot be loaded.
It works correctly when going to Special:CX in the Polish Wikipedia selecting the language from the list and typing the article title.