Merge pull request #22886 from LeeHao12/patch-2

fix: zh_cn select option

manual/index.html

@@ -34,7 +34,7 @@
 						<option value="fr">fr</option>
 						<option value="ru">ru</option>
 						<option value="ko">한국어</option>
-						<option value="zh_ch">中文</option>
+						<option value="zh_cn">中文</option>
 						<option value="ja">日本語</option>
 					</select>
 				</div>