Failsafes print and verbalize jibberish on HUD

#### Issue details
Failsafes give reasons and types in number values... but printing that on the HUD is useless.

#### Version
1.3.56.4
Plane 3.9 beta1 chibios

#### Platform
[ ] All
[ ] AntennaTracker
[ ] Copter
[X] Plane
[ ] Rover
[ ] Sub

#### Airframe type
Benchtop
#### Hardware type
Pixracer and cube

#### Logs
_Please provide a link to any relevant logs that show the issue_

The report concerns numeric failsafe reasons and types being printed and verbalized on the Plane HUD, but names no source file, test, or entry point. Start by locating the HUD failsafe display and speech handling, then verify that both outputs use readable failsafe text instead of number values.

Written by the indexing model from the issue text.