BHV-672: Clean up casing in moon.VideoFeedback

Per UX spec, "2X" => "2x".

In addition, we are no longer relying on CSS case transformation, which has issues in some languages. Instead, we'll ask translators to provide uppercased translations for PLAY, PAUSE and STOP, and use enyo.toUpperCase() to transform ilib-provided time units (e.g. "30 sec").

Enyo-DCO-1.1-Signed-Off-By: Gray Norton (gray.norton@lge.com)