add Simplified Chinese translation

material/partials/language/zh.html

@@ -0,0 +1,18 @@
+{% macro t(key) %}{{ {
+  "language": "zh",
+  "clipboard.copy": "复制",
+  "clipboard.copied": "粘贴",
+  "edit.link.title": "编辑此页",
+  "footer.previous": "后退",
+  "footer.next": "前进",
+  "meta.comments": "评论",
+  "meta.source": "来源",
+  "search.placeholder": "搜索",
+  "search.result.placeholder": "键入以开始搜索",
+  "search.result.none": "没有找到符合条件的结果",
+  "search.result.one": "找到 1 个符合条件的结果",
+  "search.result.other": "# 个符合条件的结果",
+  "search.tokenizer": "[\s\-]+",
+  "source.link.title": "前往 Github 仓库",
+  "toc.title": "目录"
+}[key] }}{% endmacro %}