character encoding - Impossible to use accents with momentJS -

i'm want create moment using 'mmmm yyyy' format. work when month name not contain accent, fail , detect invalid month when month name contain accent.

working

var mymoment = moment('janvier 2015', 'mmmm yyyy'); 

not working

var mymoment = moment('février 2015', 'mmmm yyyy'); var mymoment = moment('août 2015', 'mmmm yyyy'); 

i'm trying force utf-8 doesn't seems enough

<meta charset="utf-8"> 

try write in html static text. guarantees editor uses utf-8.

javascript specify <script charset=...> too.

alternative:

'f\u00e9vrier' , 'ao\u00fbt'. 

charmap shows codes.