Get translated default values from field system

Problem/Motivation

🐛 Translate default values Active is fixing the default values by passing text values through translation - but this is problematic because translated default values in config can be much more complex than that. Ideally we'd get the default value in the correct translation from the field system. This is going to require being able to swap out the current language while creating the form - we're going to need to some code that is able to influence language negotiation to do this and ideally that code would be in core.

Steps to reproduce

Proposed resolution

TBD

Remaining tasks

User interface changes

API changes

Data model changes