CSS Tidy: Add Opera prefix for keyframes at rules.
Merge pull request #933 from kraftbj/custom-css-o-keyframes

CSS Tidy: Add Opera prefix for keyframes at rules.
Updating 3.1 translations.
Replace subscribe form inline JavaScript with HTML5 placeholder and allow admin to set placeholder text

Use input type="email" instead of "text"

Input should be empty if !user_email

Add IE9 <label> fallback w/JavaScript

Fix fallback label formatting and add text fallback