Merge pull request #530 from jpbunaz/merge

Correction des anomalies   #523  #524  #525  #526
Corrected CSS
wording
Removed the "isNew" attribute
suppressed unused image
reworked welcome system for new users
version 3.0.17
#532 : Lien avec Firefox
Merge branch 'master' of github.com:ippontech/tatami into bugfixe
Fix #531 : Images attached on a status should have an online preview
Fix #531 : Images attached on a status should have an online preview