This worked nicely without any replacements needed:

 <div class="alert alert-danger" ng-show="alertType === 'serverError'">
                <button type="button" class="close" ng-click="alertType=''" data-dismiss="!alertType==='serverError'">
                <span aria-hidden="true">×</span><span class="sr-only">@Labels.close</span></button>
                <i class="fa fa-exclamation-circle fa-2x"></i>
                < pre >{{ alertMessage }}< /pre >
            </div>

The only thing missing is the white background of a pre instead of the red. I'll try applying the same alert class on the pre and re-test.

UPDATE. This is how it looks now and I like it. The other missing thing is the ability to resize and move the modal form.