Add strings to castle_type.json (#350)

Author: kjonosm

data/fields/castle_type.json

@@ -1,5 +1,18 @@
 {
     "key": "castle_type",
     "type": "combo",
-    "label": "Type"
+    "label": "Type",
+    "strings": {
+        "options": {
+            "defensive": "Defensive Castle",
+            "palace": "Palace",
+            "stately": "Stately Home",
+            "manor": "Manor House",
+            "fortress": "Fortress",
+            "castrum": "Roman Fort",
+            "shiro": "Shiro",
+            "kremlin": "Kremlin",
+            "hillfort": "Hillfort"
+        }
+    }
 }