Secrets: Project name changed (original was PasswordSafe)

[David Heidelberg <david ixit cz>]

Hello,

for new version, PasswordSafe is now Secrets [1].

- "Secrets" appname shouldn't be translated.
- Old gitlab link [2] will point to secrets

Thank you guys for your work and have a nice day!
David

[1] https://gitlab.gnome.org/World/secrets/
[2] https://gitlab.gnome.org/World/PasswordSafe