Update zh.json

i18n/zh.json

@@ -227,5 +227,5 @@
     "Link copied to clipboard": "链接已复制到剪贴板",
     "Paste text": "粘贴文本",
     "Tabulator key serves as character (Hit <kbd>Ctrl</kbd>+<kbd>m</kbd> or <kbd>Esc</kbd> to toggle)": "Tab 键可作为字符（按 <kbd>Ctrl</kbd>+<kbd>m</kbd> 或 <kbd>Esc</kbd> 切换开关）",
-    "Theme": "Theme"
+    "Theme": "主题"
 }