If you need regional language localization, this change to main.m will enable iOS to pick the correct regionally localized resources.

main.m

int main(int argc, char *argv[]) {
    
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    
    NSString *language = [[NSLocale preferredLanguages] objectAtIndex:0];
    NSString *locale = [[NSLocale currentLocale] objectForKey: NSLocaleCountryCode];
    
    NSString *dashed = [NSString stringWithFormat:@"%@-%@", language, locale];
    NSString *underlined = [NSString stringWithFormat:@"%@_%@", language, locale];
    
    [[NSUserDefaults standardUserDefaults] setObject:[NSArray arrayWithObjects:dashed, underlined, language, nil] 
                                              forKey:@"AppleLanguages"];
        
    int retVal = UIApplicationMain(argc, argv, nil, nil);
    
    [pool release];
    
    return retVal;
}