Drop Cockpit dependency for web translations

[lslezak]

Problem

• Drop Cockpit dependency for loading the web translations

Solution

• Reimplement translation loading without Cockpit

Notes

• The code still works with the Cockpit backend and can be merged to master without breaking anything.
• It uses the same process and same translation loading mechanism as Cockpit just without using the Cockpit library. This makes the transition easy and simple.
• In the future we can optionally change that (and even use a different framework like i18n-next).
• There are some comments marking the code for removal when the Cockpit dependency is fully dropped.

Testing

• Updated unit tests
• Tested manually

Screenshots

It still works! 😃

[lslezak]

Note: The default wrapper is cockpit.locale(PO_DATA) which calls the Cockpit implementation.

[coveralls]

coverage: 74.344% (-0.1%) from 74.493%
when pulling 3f6f97e on translations_refactoring
into 5416449 on master.

[imobachgs]

It looks good. Just a comment about the cookie name.

[imobachgs]

I am not sure about the best practices for naming cookies. We used agamaToken for the token, following the example we found in the Set-Cookie documentation (e.g., sessionId).

I would try to be consistent.

[imobachgs]

👍