change saving progression

templates/settings/admin-form.php

@@ -837,7 +837,6 @@ $choicesSizes = [
             <div class="side-menu-setting-row">
                 <div class="side-menu-setting-label">
                     <?php p($l->t('Customize application categories')); ?>
-                    <small><span class="warning"><?php p($l->t('Experimental')); ?></span></small>
                 </div>
                 <div class="side-menu-setting-form">
                     <a class="side-menu-toggler" data-target="#apps-categories-custom-list" href="#_">
@@ -957,10 +956,9 @@ $choicesSizes = [
     <div class="section" id="more">
         <button id="side-menu-save" class="btn btn-info">
             <?php p($l->t('Save')); ?>
+            <progress max="100" value="0" id="side-menu-save-progress"></progress>
         </button>
 
-        <span id="side-menu-message" class="msg"></span>
-
         <a href="<?php echo $urlGenerator->linkToRoute('side_menu.AdminSetting.exportConfiguration') ?>" target="_blank">
             <button class="btn btn-primary" >
                 <?php p($l->t('Export the configuration')); ?>