Migrate to JSON i18n

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

Change-Id: Ied3a4c392cf2ea16c6e858a1baaf9790db95e1f4

i18n/hi.json

@@ -0,0 +1,19 @@
+{
+    "@metadata": {
+        "authors": [
+            "Ansumang",
+            "Kaustubh",
+            "Siddhartha Ghai"
+        ]
+    },
+    "contributionscores": "योगदान संख्या",
+    "contributionscores-desc": "[[Special:ContributionScores|सदस्य योगदान संख्या]]के अनुसार विकि डाटाबेस दर्शाता हैं",
+    "contributionscores-top": "(पहले $1)",
+    "contributionscores-days": "आखिरी {{PLURAL:$1|$1 दिन}}",
+    "contributionscores-allrevisions": "सभी अवतरण",
+    "contributionscores-score": "गुण",
+    "contributionscores-pages": "पृष्ठ",
+    "contributionscores-changes": "बदलाव",
+    "contributionscores-username": "सदस्यनाम",
+    "contributionscores-invalidusername": "अमान्य सदस्यनाम"
+}