Latest release (2.11) of xili-language shipped today.

Some new things for theme’s developers:

A conditional function – is_xili_curlang():
/**
* Test the current language of displayed page.
*
* @since 2.11
* use for other function elsewhere
* @param "" for undefined, slug of tested language alone or an array list
* @return true or false
*/
function is_xili_curlang( $lang = false ) {
This function is also usable in plugin xili-postinpost widget.

The oldest function of xili-language – the_curlang() – is improved and now is able to return the desired property of current language. Useful for choosing condition of part display according language.
/**
* Return the current language of theme.
*
* @since 0.9.7
* @updated 2.11.0
* use by other function elsewhere
* @param slug, iso, full name, alias, charset, hidden, count
*
* @return by default the slug of language (used in query).
*/
function the_curlang( $by = 'slug' ) { // soon obsolete
return xili_curlang( $by );
}
function xili_curlang( $by = 'slug' ) {

More available preset languages in list:

Now using list provided by jetpack, an almost complete list of languages is available with english name, native name and more…
In the list, if the native name is followed by a *, the language is not associated with wp_locale (an official language managed by WP.)