Update French translation (#29664)

* Update French translation - main_fr.ts

Hello

I noticed that some translations were sticking out a bit in the new interface, so I'm proposing an update to correct this. I've arranged for the translations that cause problems to have the same number of letters including spaces as the original sentence so that they fit in the UI.

@maxime-desroches if you can give me your feedback, that would be very kind. Thank you.

* Update selfdrive/ui/translations/main_fr.ts

Co-authored-by: Maxime Desroches <desroches.maxime@gmail.com>

---------

Co-authored-by: Shane Smiskol <shane@smiskol.com>
Co-authored-by: Maxime Desroches <desroches.maxime@gmail.com>

selfdrive/ui/translations/main_fr.ts

@@ -517,7 +517,7 @@
     <name>PrimeAdWidget</name>
     <message>
         <source>Upgrade Now</source>
-        <translation>Mettre à niveau maintenant</translation>
+        <translation>Mettre à niveau</translation>
     </message>
     <message>
         <source>Become a comma prime member at connect.comma.ai</source>
@@ -860,7 +860,7 @@ Cela peut prendre jusqu&apos;à une minute.</translation>
     <name>SoftwarePanel</name>
     <message>
         <source>Updates are only downloaded while the car is off.</source>
-        <translation>Les mises à jour sont téléchargées uniquement lorsque la voiture est éteinte.</translation>
+        <translation>Les MàJ sont téléchargées uniquement si la voiture est éteinte.</translation>
     </message>
     <message>
         <source>Current Version</source>
@@ -1174,7 +1174,7 @@ Cela peut prendre jusqu&apos;à une minute.</translation>
     <name>WiFiPromptWidget</name>
     <message>
         <source>Setup Wi-Fi</source>
-        <translation>Configurer le Wi-Fi</translation>
+        <translation>Configurer Wi-Fi</translation>
     </message>
     <message>
         <source>Connect to Wi-Fi to upload driving data and help improve openpilot</source>