Fix links to Google Groups in README.md

Fixes typo in link title (CSM --> CMS)
Does not force the Google Groups interface language to Italian
Fixed BC break

Introducted in 177f5534f0e93567b473628698ac90d83551396b when 'data-texteditor-cfg' was introduced
Merge pull request #56 from bvleur/fix-readme

Fix links to Google Groups in README.md
Merge pull request #58 from janxin/master

Rewritten the menu to add blocks
Merge pull request #59 from janxin/master

MarkdownBundle improvements
Merge pull request #61 from janxin/master

added missing class attribute to link and button
Merge pull request #62 from janxin/master

updated CHANGELOG
Merge pull request #64 from janxin/master

Fixed web installer
updated CHANGELOG
merged from janxin pull request
Merge branch 'janxin-master'
merged from janxin/RedKiteCms