Use Multiselect bootstrap "Does not show accents"

I do not know what I have to confirm to show me with an accent what I put in the nonSelectedText

onInitialized: function($select, $container) {

            },
            enableHTML: false,
            buttonClass: 'btn btn-default',
            inheritClass: false,
            buttonWidth: 'auto',
            buttonContainer: '<div class="btn-group" />',
            dropRight: false,
            dropUp: false,
            selectedClass: 'active',
            // Maximum height of the dropdown menu.
            // If maximum height is exceeded a scrollbar will be displayed.
            maxHeight: false,
            checkboxName: false,
            includeSelectAllOption: false,
            includeSelectAllIfMoreThan: 0,
            selectAllText: ' Seleccionar todo',
            selectAllValue: 'multiselect-all',
            selectAllName: false,
            selectAllNumber: true,
            selectAllJustVisible: true,
            enableFiltering: false,
            enableCaseInsensitiveFiltering: false,
            enableFullValueFiltering: false,
            enableClickableOptGroups: false,
            enableCollapsibelOptGroups: false,
            filterPlaceholder: 'Buscar',
            // possible options: 'text', 'value', 'both'
            filterBehavior: 'text',
            includeFilterClearBtn: true,
            preventInputChangeEvent: false,
            nonSelectedText: 'elija una opción',
            nSelectedText: 'selected',
            allSelectedText: 'All selected',
            numberDisplayed: 3,
            disableIfEmpty: false,
            disabledText: '',
            delimiterText: ', ',
            templates: {
                button: '<button type="button" class="multiselect dropdown-toggle" data-toggle="dropdown"><span class="multiselect-selected-text"></span> <b class="caret"></b></button>',
                ul: '<ul class="multiselect-container dropdown-menu"></ul>',
                filter: '<li class="multiselect-item filter"><div class="input-group"><span class="input-group-addon"><i class="glyphicon glyphicon-search"></i></span><input class="form-control multiselect-search" type="text"></div></li>',
                filterClearBtn: '<span class="input-group-btn"><button class="btn btn-default multiselect-clear-filter" type="button"><i class="glyphicon glyphicon-remove-circle"></i></button></span>',
                li: '<li><a tabindex="0"><label></label></a></li>',
                divider: '<li class="multiselect-item divider"></li>',
                liGroup: '<li class="multiselect-item multiselect-group"><label></label></li>'
            }
        },

Here is a picture of how he shows me the letters with accents