translate English to French: Then i have a table which will store the different rosters inputs (the account jid key, the contact jid key, the name we gave to him, the subscription to the presence and the primary key on the first two fields) and the belonging to the group of each contact (the account jid key, the contact jid key, the group name and a primay key on those 3 fields).
Il permet entre autres de supprimer les fichiers inutiles comme les .dpkg-old, les paquets inutiles, etc.