Pickled Plum

Do you like a pickled plum（梅干し）? When I heard that "Ume-boshi" is called "a pickle plum" in English, I felt very strange; because I don't understand why they do.
Do you know Ume? It's a kind of plants and I agree that it's closely related to the apricot or plum. But I disagree that Ume is called Plum; because we never eat Ume as a fruit like plums. We usually use Ume when we make Ume-boshi and Ume-shu (Ume sake).
http://en.wikipedia.org/wiki/Ume

Ume has beautiful flowers

Fruits of Ume are very sour!
Maybe You can't eat fresh fruits!!

And I think that it's totally different to make between Ume-boshi and pickles and they have different taste; Ume-boshi is very sour and salty, pickles are sour and sweet(I'm not sure). Actually they're used vinegar to keep for a long time without rotting. When I make pickles, I have to add to vinegar. But when I make Ume-boshi, I don't have to add vinegar; because Ume 's originally a very sour fruit and I can get Ume vinegar from Ume in the making Ume-boshi process.

It's very sour and salty!

I don't like Ume-boshi so much. :-p

Anyway I'm wondering why the first person decided to call "Ume-boshi" "a pickled plum". I know there are many food called by Japanese name. "Sushi" "Sashimi" "Miso" "Tofu" and so on.. Why Ume-boshi isn't called "Ume-boshi" in English? I think Ume-boshi is a very traditional Japanese food and it's difficult to translate...