NSLocale+Utilities.h

@interface NSLocale (Utilities)

@property (nonatomic, readonly) NSDictionary *ISOLanguages;

+ (NSString *)getCountryNameForCode:(NSString *)countryCode;

+ (NSString *)getLanguageNameForCode:(NSString *)languageCode;

+ (NSString *)getLocalizedLanguageNameForCode:(NSString *)languageCode

@end

NSLocale+Utilities.m

#import "NSLocale+Utilities.h"

@implementation NSString (Utilities)

+ (NSDictionary *)ISOLanguages {
    NSArray *languageCodes = [NSLocale ISOLanguageCodes];
    NSMutableDictionary *languages = [NSMutableDictionary new];
    for(NSString *languageCode in languageCodes) {
        languages[languageCode.uppercaseString] = [[NSLocale currentLocale] displayNameForKey:NSLocaleIdentifier value:languageCode];
    }
    return [languages copy];
}

+ (NSString *)getCountryNameForCode:(NSString *)countryCode {
    return [[NSLocale currentLocale] displayNameForKey:NSLocaleIdentifier value:countryCode];
}

+ (NSString *)getLanguageNameForCode:(NSString *)languageCode {
    return [[NSLocale currentLocale] displayNameForKey:NSLocaleIdentifier value:[languageCode lowercaseString]];
}

+ (NSString *)getLocalizedLanguageNameForCode:(NSString *)languageCode {
    NSLocale *locale = [NSLocale localeWithLocaleIdentifier:
            [NSLocale canonicalLocaleIdentifierFromString:languageCode]];
    return [locale displayNameForKey:NSLocaleIdentifier value:[languageCode lowercaseString]];
}

@end