Bonjour

I am using English(United states) and French(canada) localization files, it work fine for my own text values and messages.

But when I try to open the security dialog with the French(canada) localization I have this error message.

The specified key [SFSTText - None] was not found within the localization database.

Can help me please, thank you

Yep, French Canada is region code 3084, which is not in the Localization Files of the Security source code. Have you tried setting it to 1036? I checked it and the "SFSTText - None" key belongs to it.