Recent store trends show that offering your app in English will cover only about 25% of Windows Phone customers. Adding Spanish, French, Mandarin, Russian, and German can increase coverage to more than 75% of Windows Phone customers.
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Localizing a Windows Phone 8 Application
Recent store trends show that offering your app in English will cover only about 25% of Windows Phone customers. Adding Spanish, French, Mandarin, Russian, and German can increase coverage to more than 75% of Windows Phone customers.
Full article