Add translatable strings to archaeological_site type field (#707)

Author: kjonosm

data/fields/archaeological_site.json

@@ -1,5 +1,22 @@
 {
     "key": "archaeological_site",
     "type": "combo",
-    "label": "Type"
+    "label": "Type",
+    "strings": {
+        "options": {
+            "baths": "Baths",
+            "city": "Historic City",
+            "crannog": "Crannog",
+            "enclosure": "Enclosure",
+            "fortification": "Fortification",
+            "hut_circle": "Hut Circle",
+            "megalith": "Megalith",
+            "necropolis": "Necropolis",
+            "petroglyph": "Rock Carving",
+            "roman_circus": "Roman Circus",
+            "roman_villa": "Roman Villa",
+            "settlement": "Historic Settlement",
+            "tumulus": "Tumulus"
+        }
+    }
 }