Provide Pontoon as a service to external parties

[heyakyra]

Also posted to https://connect.mozilla.org/t5/ideas/open-up-translation-platform-for-project-fluent-pontoon/idi-p/37389

Project Fluent is really the best standard for supporting complex translations in software projects: https://projectfluent.org/

Pontoon is a great tool to help create the translations from the base language: https://pontoon.mozilla.org/projects/

If Pontoon could become a multi-tenant platform where organizations can join and add their own projects to be translated, there's some real monetization possibility (in the same vein as bringing back Lockwise with enterprise features).

Currently, any companies adopting Fluent will often need to outsource the actual translation work to a third party that supports .ftl translation files, such as Locize. If, instead, Mozilla hosted Pontoon for third party use and added a payment system, it could promote Fluent and bring in revenue at the same time. Plus, it would be great if the service was free for open source projects!

[mathjazz]

Hey @heyakyra, thanks for filing the issue!

I've made the title more explicit about what the actual goal. Multi-tenancy would obviously be a required step to get there.

Marking as P5, since we don't have immediate plans to work on this.