That's the common expression on internet fora for followers of Judaism and citizens of Israel who push for certain issues to be seen their way.
The fact of the matter is that Jerusalem is not the internationally recognized capital of Israel. Its status is yet to be determinded in negotiations with a future Palestinian-Arab government of an independent and unoccupied Palestine. The personal opinions of Jews or Israelis who want to depict the situation in a way sympathetic to them, for obvious reasons, cannot dictate the content of an internationally accessible article on wikipedia. This is no propaganda platform and the want to post their minority opinion they should mark it as that.