Make it posible to let mails show e.g.:
`Max Musternam (via gitea.kithara.com) <gitea@kithara.com>`
Docs: https://gitea.com/gitea/docs/pulls/23
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*Sponsored by Kithara Software GmbH*
(cherry picked from commit 0f533241829d0d48aa16a91e7dc0614fe50bc317)
Conflicts:
- services/mailer/mail_release.go
services/mailer/mail_test.go
In both cases, applied the changes manually.