The new 2.19 version of Skype will also add email, texts and Skype updates to your Action Center, in Windows Phone 8.1. In addition, Skype now supports 51 languages for Windows Phone users, up from the 19 it previously supported. And the guys and gals at Skype have had their listening ears on. The latest version of the Windows Phone app gives you the ability to edit your last message, something requested by users who respond to messages quickly, without thinking about spelling errors. Another change improves push notifications on Skype, "to get you quickly back into the conversations you care about."
The latest update to Skype for Windows Phone also includes the usual general bug fixes and improvements. For those of you who don't remember, or were into Sponge Bob at the time, Skype has actually been owned by Microsoft since October, 2011.
source: Skype via WPCentral