Hi layzone
If you want to change sidebar text then edit this file /templates/ja_teline_V/tpls/blocks/off-canvas.php line 21
<h2 class="t3-off-canvas-header-title">Sidebar</h2>
If you want to remove it then add to your custom.css file
.t3-off-canvas .t3-off-canvas-header h2 {
display:none;
}
Regards