I'm considering to go watch The Square with Danish subs, although I don't know Danish.
Is the film mostly in English?
Is the film comprehensible assuming I wouldn't understand the Swedish/Danish dialog?
The movie has been nominated to an academy award in the Best Foreign Language Film category. The rules about foreign language film (rule 13) states
A foreign language film is defined as a feature-length motion picture (defined as over 40 minutes) produced outside the United States of America with a predominantly non-English dialogue track. Animated and documentary feature films are permitted.
So most of the movie is not in English. I haven't seen it, so I don't know if it's comprehensible without the Danish/Swedish parts.