Rename and use language strings for welcome screen
Take user to welcome screen until component configured
Add welcome message to installation
Issue #169 - load required css for installation screen
Added checkoff layout
Issue #169 - Handle specialized install/update messages
Add check items layout
Light border color in images
Issue #169 - Display current status of extension settings
Margin for welcome steps
Welcome string for language
Checkoff items margin
Remove welcome message after install
Fix some problems in SimplerenewHelper::getNotices()
Issue #169 - better checking and messages for welcome/configuration page