setup.js

window.vueData = {
    primary: {
        show: true,
        message: '',
        classes: [],
        language: 'en'
    }
};

this.vue = new Vue({
    el: '#app',
    data: window.vueData
});

template.html

<div class="container" id="app">
    <div class="row primary">
        <div class="col-xs-12">
            <h1 v-bind:class="primary.classes.concat(['title'])"
                lang="{{ primary.language || 'en' }}"
                v-show="primary.show">
                {{ primary.message }}
            </h1>
        </div>
    </div>
</div>