Sync WMS sources [skip travis]

Author: rbuffat

sources/europe/de/Niedersachsen-DOP20.geojson

@@ -2920,7 +2920,11 @@
             "url": "https://ni-lgln-opengeodata.hub.arcgis.com/"
         },
         "available_projections": [
+            "EPSG:3034",
+            "EPSG:3035",
+            "EPSG:3044",
             "EPSG:3857",
+            "EPSG:4258",
             "EPSG:4326",
             "EPSG:4647",
             "EPSG:25832",