Adding new German Translation

With may thanks to Christian Conradi for providing the translation
Minor css fix to Marketing box image formatting
Fix for bad foratting of quiz question bank

Fix submitted by Chris Kenniburg
Create theme_essential.php

Adding new Russian Translation
Merge pull request #33 from felixod/patch-3

Create theme_essential.php
Updating Readme with new language options
Add Russian populare social network
Add Russian populare social network
Add Russian populare social network
Add Russian populare social network
Minor CSS fixes
Social icons now show brand color when hovered over
Add attribution info to CSS files
New icons for frontpage sections

new icns added for Site News, Course Categories, etc
Minor format changes to frontpage course listings
Merge pull request #37 from felixod/patch-7

Add Russian populare social network
Merge pull request #36 from felixod/patch-6

Add Russian populare social network
Merge pull request #35 from felixod/patch-4

Add Russian populare social network
Merge pull request #34 from felixod/patch-5

Add Russian populare social network
Adding Turkish Translation provided by Mesut Güngör