When there are more than 2 countries, just list "n countries"

Users were having problems when they looked up things like "English"
and were presented with "United Arab Emirates" and such, as these
colonial languages are spoken in so many countries.
So this just displays the number of countries.
I still think I'm seeing the problem I pointed out before (was in the original, too): line 248 adds country as a subitem, while line 251 adds lang.Country. Since country is initialized from lang.Country when there are 1 or 2 countries, seems like it would give two identical subitems (as old lines 236/239 also did, so maybe it's on purpose).