Correct grammar — verb should be used instead of noun

What does this MR do?

Change the text of green button "Comment" in French version from a noun ("Commentaire" erroneous) to the corresponding verb ("Commenter").

What are the relevant issue numbers?

Does this MR meet the acceptance criteria?

This minor fix does not get in conflict with any of the acceptance criteria.

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer