Long story short... I was working with a multi language windows phoen app. I found Multilingual app toolkit. It was able to use translator & make your app multilingual in minutes.
But I found a problem. App language was automatically selected based on Region in WP settings. Now what if a person need different language then his region setting. For eg. here in India, many people use English in phone, but how they can tell that this particular app they want to access in Hindi.
To overcome this problem we edited App.xaml.cs InitializePhoneApplication() function. Whenever initialized, the language will be hindi. User can change this from Application bar.
So enjoy this simple, yet useful sample file & create some great apps. :)