Migrate to JSON i18n

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

Change-Id: Ied3a4c392cf2ea16c6e858a1baaf9790db95e1f4

i18n/zh-hans.json

@@ -0,0 +1,25 @@
+{
+    "@metadata": {
+        "authors": [
+            "Dimension",
+            "Hydra",
+            "Liuxinyu970226",
+            "PhiLiP",
+            "Shinjiman",
+            "Shirayuki"
+        ]
+    },
+    "contributionscores": "贡献分数",
+    "contributionscores-desc": "根据在wiki数据库中给出最高的[[Special:ContributionScores|用户贡献容量]]",
+    "contributionscores-info": "得分主要考量具有独特性的编辑，同时考虑编辑量。",
+    "contributionscores-top": "（最高$1名）",
+    "contributionscores-days": "最近$1天",
+    "contributionscores-allrevisions": "所有的时间",
+    "contributionscores-score": "分数",
+    "contributionscores-rank": "排名",
+    "contributionscores-pages": "页面",
+    "contributionscores-changes": "更改",
+    "contributionscores-username": "用户名",
+    "contributionscores-invalidusername": "无效的用户名",
+    "contributionscores-invalidmetric": "无效的公制"
+}