Store the locale code in firmware EEPROM instead

[valeriansaliou]

The locale code should be stored in the firmware EEPROM itself, that way the Control UI can be ran on a read-only partition, which is much better in terms of durability.

A telemetry protocol update should be done for this to be possible.

[dsferruzza]

Depending on how we can manipulate the EEPROM, it may or may not be useful to:

• use a versioned "schema" of the data we store
• use a migration system for when we need to change the schema while keeping the data
• decide what API we expose through the telemetry/control protocol
• provide a way to do a hard reset of the EEPROM (via one of the maintenance buttons?)

[valeriansaliou]

Right, those are all good ideas. All those would be abstracted from the UI by the firmware & telemetry protocol.

[valeriansaliou]

Ref makers-for-life/makair-telemetry@af57f23