You can get a list of languages translated in the languages locale with the following code:
Objective-C:
NSArray *languages = [NSLocale preferredLanguages];
for (NSString *lang in languages)
{
NSLocale *locale = [[NSLocale alloc] initWithLocaleIdentifier:lang];
NSString *translated = [locale displayNameForKey:NSLocaleIdentifier value:lang];
NSLog(@"%@, %@", lang, translated);
}
Swift:
let languages = NSLocale.preferredLanguages()
for lang in languages {
let locale = NSLocale(localeIdentifier: lang)
let translated = locale.displayNameForKey(NSLocaleIdentifier, value: lang)!
print("\(lang), \(translated)")
}
Output:
en, English fr, français de, Deutsch ja, 日本語 nl, Nederlands ...
I hope that this answers the first part of your question and perhaps helps with the second part.
Swift 3 update:
let languages = NSLocale.preferredLanguages
for lang in languages {
let locale = NSLocale(localeIdentifier: lang)
let translated = locale.displayName(forKey: NSLocale.Key.identifier, value: lang)!
print("\(lang), \(translated)")
}