ui: tape/BackupOverview: rename action column to restore

to make it clear that this button is for restore and for
now we do not have any plans to add buttons here

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>

www/tape/BackupOverview.js

@@ -266,7 +266,7 @@ Ext.define('PBS.TapeManagement.BackupOverview', {
 	    flex: 3,
 	},
 	{
-	    header: gettext('Actions'),
+	    header: gettext('Restore'),
 	    xtype: 'actioncolumn',
 	    items: [
 		{