Merge pull request #525 from renaudJennyRBS/seo

Seo
Add-user should not be a dev command
Merge pull request #526 from franckstauffer/i18n

Add-user should not be a dev command
Cleanup.
Backoffice migration to Twitter Bootstrap 3 (login form).
- Added `MainMenu.addAsideTpl()` and `MainMenu.addAside()` to add aside boxes (aka "aside") in the left column.
- Added i18n aside as a template.
- Added SEO aside.
Merge pull request #528 from fredericbonjour/Admin

Added "Aside" feature in the left column and added Aside for SEO.
Allow auth with e-mail or login
Merge pull request #529 from franckstauffer/i18n

Allow auth with e-mail or login
[FIX] Add type property in plugin.json on plugin initialization.
Remove obsolete attributes in document.xsd.
[NEW] Add translation forms.
[FIX] All icons on one line in fields list.
Merge pull request #530 from intportg/dev

Dev
Fix localisation in clipboard, rich-text, admin menu, local copy
Merge pull request #531 from loiccouturier/master

Fix localisation in clipboard, rich-text, admin menu, local copy
Moved oauth login form in admin module
Merge pull request #532 from franckstauffer/i18n

Moved oauth login form in admin module
Localization and SEO Asides are not displayed anymore when creating a Document.
Localization Aside is not displayed anymore when there is only one language.