Hi Pascal,Thank you for your post!
Even though you can translate the elements of a list, the properties come with the label of the language in which SharePoint is: in this case French. I made a similar test and reached the same result, precisely because no translation is made on the fly, but instead the translation that SharePlus can show is to match the iPad's language alone.
Hoping to have clarified, do let us know please how else we can assist.
Adrián PévereSenior Support Specialist+1 (609) 448 2000 ext 1378Enterprise Mobility | Infragistics, Inc.