Can I use multilingual keywords?
Yes, but a keyword only matches when its words appear in the address of the portal page, so check how a market writes its place names first.
A keyword matches when every word in it appears in the address of the portal page being viewed, whatever the reader's language. Use the spelling the portal uses in its addresses — open a search results page for the place and look at the address bar — and add a keyword line for each spelling you want to cover.