I would guess the API to use would depend on what you need it for. I too use the portal value in Grail:
self.portal = GetCVar("portal")
because specific quests are not available to the European servers. Since this covers Europe and not a specific language the portal value seems to be the right way to go.
However, I have not checked on whether this is still set since I originally put in in place many moons ago.
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