Add translatable strings to "marker" field

data/fields/marker.json

@@ -1,5 +1,33 @@
 {
     "key": "marker",
     "type": "typeCombo",
-    "label": "Type"
+    "label": "Type",
+    "strings": {
+        "options": {
+            "aerial": {
+                "title": "Aerial",
+                "description": "Designed to be seen by aerial inspection."
+            },
+            "ground": {
+                "title": "Ground",
+                "description": "Flat marker fixed directly onto the ground."
+            },
+            "pedestal": {
+                "title": "Pedestal",
+                "description": "Raised marker mounted on a small base."
+            },
+            "plate": {
+                "title": "Plate",
+                "description": "Flat marker mounted directly on walls or similar."
+            },
+            "post": {
+                "title": "Post",
+                "description": "Raised marker mounted on a small pole or mast."
+            },
+            "stone": {
+                "title": "Stone",
+                "description": "Markings directly etched or painted on a stone."
+            }
+        }
+    }
 }