Various additions

[dsferruzza]

• Add setting to persist UI locale Add settings to telemetry #31
• Add a new telemetry message for errors telemetry message for errors #33
• Add a new telemetry message for EOL test results telemetry message for factory end of line test #34
  • Add data in success messages
• Add new setting (+ in stopped & machine state) → patient's height in cm
• Prepare a PR in makair-firmware

[dsferruzza]

@valeriansaliou This work is not finished yet!

I added the UiLocale struct in the locale.rs file as "a bunch of helper functions/traits to ease building the value of the UiLocale control messages".
➡️ What do you think of this first implementation? Do you miss something here?

[valeriansaliou]

LGTM. Except that I wouldnt name it UiLocale but simply Locale as it's really the locale code for the whole MakAir system, we don't need to be specific that it's only currently used by the UI.