Updating from ULS upstream

* Localization updates.
* Added localization for Dutch informal.
* Performance improvements - see
  https://github.com/wikimedia/jquery.uls/pull/122

Change-Id: I6a76097722ae7ab2774172838823d73da5050581

lib/jquery.uls/i18n/nl-informal.json

@@ -0,0 +1,15 @@
+{
+    "@metadata": {
+        "authors": [
+            "Carsrac"
+        ]
+    },
+    "uls-select-language": "Kies taal",
+    "uls-region-WW": "Wereldwijd",
+    "uls-region-SP": "Speciaal",
+    "uls-region-AM": "Amerika",
+    "uls-region-AF": "Afrika",
+    "uls-region-EU": "Europa",
+    "uls-region-AS": "Azië",
+    "uls-region-ME": "Midden-Oosten"
+}