Unfortunately, not all languages are supported by iTunes Connect. This means on some occasions your app may be localized but the App Store Description and Keywords will still be in the master language, which is usually English. The good news is that the list of languages supported by iTunes connect is growing, so unsupported languages might not always stay that way.
This article covers which are the most popular languages in 2016. The list is comprised from various sources, including Applingua's own experience.
If you've localized your game and the languages aren't showing up in the iOS App Store, then follow these simple steps before submitting your next build.