Localized weekday from NSDate in iOs app

I'm trying to get the localized weekday from an nsdate object

+ (NSString *)localizedWeekdayForDate:(NSDate *)date
{
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    NSString *language = [[[NSBundle mainBundle] preferredLocalizations] objectAtIndex:0];
    dateFormatter.dateFormat = [NSDateFormatter dateFormatFromTemplate:@"EEEE" options:0 locale:[NSLocale localeWithLocaleIdentifier:language]];
    NSString *formattedDateString = [dateFormatter stringFromDate:date];
    return formattedDateString;
}

The language string is always "en" ... even thou the device language is not english... I tried [NSLocale currentLocale]; as well as preferedLanguages... this also doesn't work..

Any suggestions?