Point 1 : 

On all mails remove second button "View in workspace". 

Point 2 :

a/ 

When an answer is added, following  message is received : 

=> Update subject :

• [Espace projet XX] Nouvelle réponse au sujet "XX"

b/ Update also mail in english. 

Point 3 :

a/

When an answer is accepted, following message is received : 

1. Update subject : [Espace projet XX] Réponse retenur pour le sujet "XX"
2. a retenu (without e)
3. a été retenue

b/ Update also mail in english

Point 4 :

a/ 

When a subject is updated, mail title is only "[Espace projet XX] Sujet modifié. 

=> Add the subject title : [Espace projet XX] Sujet XX modifié. 

(as for tasks)

b/ Update also mail in english

Point 5 :

a/ 

When a subject is deleted, mail title is only "[Espace projet XX] Sujet supprimé

=> Update title to : [Espace projet XX] Suppression du sujet XX. 

(as for tasks)

b/ Update also mail in english