[Feature] Invitation Link

[Daniele-rolli]

Is your feature request related to a problem? Please describe.
It's impossible to invite people to collaborate on a project if you don't know their email addresses, and this is especially challenging for open-source projects with volunteer contributors.

Describe the solution you'd like
I believe an invitation link, tied to a single project and with preset permissions, would be the solution. This would give people the possibility to sign up to the Traduora instance and request access to a project so that they can contribute to its translations. Platforms like Crowdin or Weblate already have similar features.

Describe alternatives you've considered
Asking contributors to send an email so that they could be added to the team.