Is there a message or notification in Win32 that detects when user changes locale?

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Answer 1

Windows sends a WM_SETTINGCHANGE message, with the wParam set to 0, and the lParam set to a character string containing the value intl. This is described in the documentation for WM_SETTINGCHANGE under the Parameters section:

wParam ...

When the system sends this message as a result of a change in locale settings, this parameter is zero.

lParam ...

When the system sends this message as a result of a change in locale settings, this parameter points to the string "intl".

Your application will need to respond to the message and make any necessary changes yourself in child dialogs and controls.