About [[iNaturalist:Uploader.tooltips.add/en]]
I'm not sure, but I think the meaning of "observation" on iNaturalist messages is researching animals, plants, nature, etc....
This is only my assumption, based on other iNaturalist messages and the iNaturalist Wikipedia article. Perhaps pozorování is the appropriate Czech word in this case? (I do not know Czech at all, this word is only a guess based on Google Translate.)
P.S. It's annoying me as well that iNaturalist messages don't have any useful descriptions.
By the way, you seem to be very lucky, because the Czech Wikipedia also has an article about iNaturalist. It might be useful for understanding some strings.
I think you are right. It looks like "pozorování" will be correct one. I think I'll correct wrong translations to this option and translate untranslated strings to this option as well. If this is not correct, It will be unified at least and could be easier to fix in the future. Does anybody know, how to list translations, which does not contain "pozorování", but original english version contains "observation(s)"?