lookup places for address tags for rank < 30

lookup places for address tags for rank < 30

While previously the content of addr:* tags was only added
to the list of address search keywords, we now really look up
the matching place. This has the advantage that we pull in all
potential translations from the place, just like all the other
address terms that are looked up by neighbourhood search.

If no place can be found for a given name, the content of the
addr:* tag is still added to the search keywords as before.