Fix translation

[martinqt]

No description provided.

[skeud]

@martinqt thanks for these new images translations

Can you change both commits:

• for "images/book/security_admin_role_access.png", can you replace "Entres!" by "Entre!" (impératif)
• for "Vérifiez" and "Déterminez", I would really put the indicative form and not imperative => "Vérifie" and "Détermine" as the action is "done" by both titles respectively "1. Authentification" and "2. Autorisation".
  Sorry for being picky... what do you think @gregquat ?

Best.

[martinqt]

@skeud my bad for both. For "Vérifiez" and "Déterminez" i misread and corrected "Vérifier" and "Déterminer" to the actual form. Shame on me.