- (void)applicationDidFinishLaunching:(UIApplication *)application {
 
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSArray *languages = [defaults objectForKey:@"AppleLanguages"];
NSString *currentLanguage = [languages objectAtIndex:0];
 
NSLog(@"Current Locale: %@", [[NSLocale currentLocale] localeIdentifier]);
NSLog(@"Current language: %@", currentLanguage);
NSLog(@"Welcome Text: %@", NSLocalizedString(@"WelcomeKey", @""));
 
// Override point for customization after application launch
[window makeKeyAndVisible];
}

http://www.iphonesdkarticles.com/2008/11/localizing-iphone-apps.html

How to add multiple Language localization to an App.

Localized Language Tutorial

c, iphone

Objective C