Trouble with plugin development

Hey, I have this code:

add_action('plugins_loaded', 'check_language');

function check_language(){

	$userid = wp_get_current_user()->ID;

	if(substr($_SERVER['REQUEST_URI'], 0, 6) == '/lang/'){
		switch(substr($_SERVER['REQUEST_URI'], 6, 2)){

			case 'en' : $language = 'english'; break;
			case 'fr' : $language = 'french'; break;
			default : $language = 'english'; break;

		}

		update_user_meta( $userid, 'language', $language );
	}

}

Now it’s in the plugin, but, it only ever stores french in the DB, can anyone see why this is? I am pulling my hair out cause I am surely missing something stupid.

I have 2 pages under the parent of ‘language’ which are english and french. The URLS are:
english: /lang/en/
french: /lang/fr/

Thanks in advance.