in premade finder can I get into language selection "English (general)" please? As I really don't know any difference between those 3 and I don't want to filter 2 out when selecting 1. So ... please give us 1 that shows all 3 englishes and nothing else.

English UK, English US and English Oceanic is all the same languages. Please remove all and replace with English. Plain and simple.

oceanic and US are distinct as it helps identify those servers in world content (there is a blizz limitation)

US and UK english are also different regions.