Edit in JSFiddle

// how to set non-selected-text in bootstrap-multiselect plugin
$(function(){
    $('#status').multiselect({
        enableFiltering:true,
        enableCaseInsensitiveFiltering:true,
        nonSelectedText:'Status: ALL'
    });
});

<select id="status" multiple="multiple">
    <option value="1">Active</option>
    <option value="2">Passive</option>
</select>