Product and version: FMS 18.104.22.1682
OS and version: OSX El Capitan 10.11.3
Browser and version: Safari 9.0.3 (11601.4.4)
Hardware: MacBook Pro
Date popovers are not localised.
How to replicate:
Workaround (if any): none, except not using them.
The database was created on a DD/MM/YY system where the week starts on monday.
As you can see in the little movie everything works quite well using a Pro Client, It also works correct using Go.
The movie demonstrates the calendar behaviour in WebDirect. The popover is in US format, the week also starts on sunday. Entering a date using the popover results in the field containing the wrong date.
This is a bug reported by a customer, and I have reproduced it on a clean test server with DD//MM/YY system settings.