Remove GitHub related widgets

Unneccessary: the text links do the job just fine in this case
Remove prat0318's GA snippet
Remove dividers

They are not styled in line with current theme
Apply Atlantis 2014 customizations to OG metadata
Declare OG locale
Initiate Facebook's JavaScript SDK using custom app id for 2048-atlantis
Add Facebook share button
Translate end-of-game buttons to Swedish
Add custom Facebook share button in end-of-game dialog