Set keyboard layout into en_US on windows (keychain and key manager)

[roman-modelist-dev]

It is necessary to set keyboard layout always to en_US on windows for compatibility with linux version.

• Need to figure out what layouts are installed in the case of UK localization.
• Need to store current layout, switch to en_US or en_US_international,
• when password entry procedure will be finished need to restore layout to previous state.
• Need to show country flag of keyboard layout (USA).

If system has no en_US or en_US_international layout it must be installation error (@nuclearrazor) and runtime error (@IluhaPuts).