Issue #3064547 by markcarver, Giuseppe87: Modal title inherits header attributes

        variables = $.extend(true, {}, defaults, variables);

        if (typeof variables.title === 'string') {

          variables.title = $.extend({}, defaults, { content: variables.title });

          variables.title = $.extend({}, defaults.title, { content: variables.title });

        }

        variables.title.attributes = Attributes.create(defaults.title.attributes).merge(variables.title.attributes);

        var title = Drupal.theme('bootstrapModalTitle', variables.title);

        if (title) {

          var attributes = Attributes.create(defaults.attributes).merge(variables.attributes);