Add translatable strings to traffic_calming type field (#699)

the value `choked_island` was omitted for now, see https://github.com/openstreetmap/id-tagging-schema/pull/699/files#r1055517229

Author: kjonosm

data/fields/traffic_calming.json

@@ -7,5 +7,21 @@
         "hump",
         "speed",
         "slow"
-    ]
+    ],
+    "strings": {
+        "options": {
+            "bump": "Speed Bump",
+            "chicane": "Traffic Chicane",
+            "choker": "Traffic Choker",
+            "choked_table": "Choked Speed Table",
+            "cushion": "Speed Chushion",
+            "dip": "Dip",
+            "double_dip": "Double Dip",
+            "hump": "Speed Hump",
+            "island": "Traffic Island",
+            "mini_bumps": "Mini Speed Bumps",
+            "rumble_strip": "Rumble Strip",
+            "table": "Speed Table"
+        }
+    }
 }