ISIS-537 Add support for disabled menu items
ISIS-537 Fix the layout of IsisPasswordPanel. (reported by BootLint)
ISIS-537 Use col-xs-** - it scales automatically on all screen sizes. Apply width:100% to all non-compact labels, use class="help-block" for inline feedback
ISIS-537 Re-apply the width:100% for Select2. It seems it doesn't use Bootstrap's class="form-control" properly
ISIS-537 Do not replace the modal window markup because this way Bootstrap is not able to hide it with JavaScript and remove the backdrop

Bootstrap loses the reference to the HTML element after Wicket replaces it with a new one
ISIS-537 Add sorting indicators to IsisAjaxHeadersToolbar. Uses Bootstrap icons so it will automatically apply the styling of the current theme