Describe the bug
The calendar for selecting the expiration date is Monday-based -- that is, the week is Monday through Sunday.

However, the abbreviations for the calendar are displayed as Sunday through Saturday. On desktop, you can hover the mouse over "Sun", and it will display the full version as "Monday", and so on.

This occurs both in the standalone app and when viewing it in my browser on Windows 10.

Screenshots

The mouse cursor itself is not visible; however, the mouse is hovering over "Sun" here.

A more obvious instance of the same thing -- the mouse is hovering over "Sat" here.

Environment
KeeWeb v1.17.4 (f8a85af, 2021-03-18)
Environment: electron v12.0.0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) KeeWeb/1.17.4 Chrome/89.0.4389.69 Electron/12.0.0 Safari/537.36

Kdbx File
Happens in both my own file, and in the Demo file.