Multilinguality (#279)

Improve multilinguality: names in 57 languages, name:latin, name:nonlatin, name_int. Fixes #211 #252 #80.

See #279 for more info.

layers/poi/name.sql

@@ -0,0 +1,5 @@
+DO $$
+BEGIN
+  update osm_poi_point SET tags = slice_language_tags(tags) || get_basic_names(tags, geometry);
+  update osm_poi_polygon SET tags = slice_language_tags(tags) || get_basic_names(tags, geometry);
+END $$;