You can load the locale you want into localStorage, then refresh the page. Have the script below load the i18n file you need. Changing the locale on the fly isn’t supported yet.
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.min.js"></script>
<script>
var locale = JSON.parse(localStorage.getItem('locale'));
if (locale) {
document.write('<script src="scripts/i18n/angular-locale_'+locale+'.js"><\/script>');
}
</script>