I changed the title of the registation email from "Welcome to Gitea" to
"Welcome to (appname)". I did this by substituting 'Gitea' in
register_notify to %s and formating the registration title in mail.go. I
changed this for all the languages I could, but I struggled to changed
the translation file for Farsi. I have attached the screenshots of
before and after and the related issue below.
Related issue:
https://github.com/go-gitea/gitea/issues/31108
Before change:

After:

---------
Signed-off-by: Sunny Wan <Sunnywan2020@gmail.com>
Co-authored-by: 6543 <6543@obermui.de>
(cherry picked from commit 4913edaa70a48f7c5a524f680ca921ed515d6ec2)
Conflicts:
- options/locale/locale_en-US.ini
Applied the change manually. Confliced because we don't have `register_notify.title`.
- services/mailer/mail.go
Adapted the change to Forgejo. We don't have `u.EmailTo` due to
not picking gitea#31527 (yet).