It’s pretty straight forward. Check out this post:
…and make sure the folders you use follow this format “[Language Abbreviation].lproj” as commenter #4 points out 
If you miss one of the major languages, your app will default to English. As of this post, the iPhone OS supports the following languages:
English (U.S), English (UK), French (France), German, Traditional Chinese, Simplified Chinese, Dutch, Italian, Spanish, Portuguese (Brazil), Portuguese (Portugal), Danish, Swedish, Finnish, Norwegian, Korean, Japanese, Russian, Polish, Turkish, Ukrainian, Arabic, Thai, Czech, Greek, Hebrew, Indonesian, Malay, Romanian, Slovak, and Croatian
Unfortunately, the link you are refering to does not exist anymore, not even in Archive.org.
Is there any other way to get the article?