How can we customize the planning (in ME>TIME) and change the display from "hrs" (hours) to "jrs" ?

Summary

Need to change the display from "hrs" to "jrs" in the employee's planning

Content

Our need is to customize the planning accessible via ME > TIME 

The customization consists in modifying "hrs" (that is, HOURS; in French, "Heures") into "jrs" (that is, DAYS; in French, "Jours")

- See screenshot attached - 

We have tried different tools from the sandbox, including Page Composer but were not able to modify this display.

Do any of you know how this modification can be achieved ? 

Thanks !

Version

20C