Migrate to JSON i18n

Procedure per https://www.mediawiki.org/wiki/Manual:GenerateJsonI18n.php
with shim.

Change-Id: Ied3a4c392cf2ea16c6e858a1baaf9790db95e1f4

i18n/avk.json

@@ -0,0 +1,15 @@
+{
+    "@metadata": {
+        "authors": [
+            "Sab"
+        ]
+    },
+    "contributionscores": "Weberajorist",
+    "contributionscores-top": "(Taneaf $1)",
+    "contributionscores-days": "Ironokaf $1 viel",
+    "contributionscores-allrevisions": "Betakseem",
+    "contributionscores-score": "Jorist",
+    "contributionscores-pages": "Bu",
+    "contributionscores-changes": "Betaks",
+    "contributionscores-username": "Favesikyolt"
+}