Add set button and view button at mapillary field (#9339)

more info see https://github.com/openstreetmap/iD/issues/6196#issuecomment-751460516
I do the b. (set button) and c. (view button)
order: click OSM object -> click mapillary layer will close the OSM input field. need to do in reverse order

data/core.yaml

@@ -786,6 +786,8 @@ en:
       inch: in
     max_length_reached: "This string is longer than the maximum length of {maxChars} characters. Anything exceeding that length will be truncated."
     set_today: "Sets the value to today."
+    set_mapillary: "Sets the current ID of mapillary"
+    show_mapillary_from_field: "Show image on viewer"
   background:
     title: Background
     description: Background Settings