Add translation variables for place types

frontend/de/placetypes.json

@@ -0,0 +1,13 @@
+{
+    "tlPlacetypes": [
+        "Administrative",
+        "Historisch",
+        "Regionen",
+        "Stra\u00dfen",
+        "Geb\u00e4ude",
+        "Berge",
+        "W\u00e4lder",
+        "Gew\u00e4sser",
+        "Inseln"
+    ]
+}