add fields for level crossing (#194)

interim/source_strings.yaml

@@ -597,9 +597,29 @@ en:
       crossing:
         # crossing=*
         label: Type
+      crossing/barrier:
+        # 'crossing:barrier=*'
+        label: Barrier Arm
+        options:
+          # 'crossing:barrier=double_half'
+          double_half: Double Half
+          # 'crossing:barrier=full'
+          full: Full
+          # 'crossing:barrier=half'
+          half: Half
+          # 'crossing:barrier=no'
+          'no': 'no'
+          # 'crossing:barrier=yes'
+          'yes': 'yes'
+      crossing/bell:
+        # 'crossing:bell=*'
+        label: Bell
       crossing/island:
         # 'crossing:island=*'
         label: Refuge Island
+      crossing/light:
+        # 'crossing:light=*'
+        label: Lights
       cuisine:
         # cuisine=*
         label: Cuisines