update bilingual

lib/views/admin/markdown.html

@@ -84,7 +84,7 @@
         <div class="form-group">
           <div class="col-xs-offset-4 col-xs-5">
             <input type="hidden" name="_csrf" value="{{ csrf() }}">
-            <button type="submit" class="btn btn-primary">更新</button>
+            <button type="submit" class="btn btn-primary">{{ t("Update") }}</button>
           </div>
         </div>
       </fieldset>