Maybe not technically a bug, but when the location is edited for any number of observations (including just one) the button says “Update Observations” (plural). Maybe that’s a fix not worth the while, but perhaps it could universally say “Update Observation(s)” instead. Is this also the case in other languages?
A very technical and minor complaint, and the only reason I noticed it was because I thought I was editing multiple observations when I wasn’t and I was very confused (momentarily).