Translate the labels for the “Previous” and “Next” buttons in a Question Set

Hello,

I’m using H5P in WordPress.

The update of the Question Set library to version 1.21.13 seems to have introduced several changes.
Changes to the layout.
But also changes to the navigation interface within Question Set exercises.

In the Options and Texts section of the Question Set editor, there are now two fields for defining the labels for the Back and Next buttons.
Two new fields, Back Button Label and Next Button Label, appear to have been added.
Their default values are Previous and Next.

I am encountering the following problem: I am unable to define a new French translation for these new labels.
I tried editing the file wp-content/uploads/h5p/libraries/H5P.QuestionSet-1.20/language/fr.json but it doesn’t work.

I have 80 Question Sets in a course and I’d like to avoid having to re-edit them all to change the labels manually as much as possible.
Is there a way to change the default labels for these two fields?

Thank you