Fix centering of continue/replay button
Make :focus on video player controls visible
Merge remote branch 'gauthierm/bug-796049-video-slideshow' into bug-796049-video-slideshow
Merge remote branch 'gauthierm/bug-796049-video-slideshow' into bug-796049-video-slideshow
Fix flipped twitter/facebook icons
Add alt text and ARIA roles to actionable elements.