Registration email contact name should be changed

[jonas-martinez]

As you can see on this screenshot, I received the registration email but the name of the sender (contact@lenra.io) is contact which is not really good. Maybe we should rename to lenra or the full contact@lenra.io

[taorepoara]

I think just Lenra should be good

[pichoemr]

Resolved in lenra-io/server#335