user.changeLanguage:after
return [
    'hooks' => [
        'user.changeLanguage:after' => function (Kirby\Cms\User $newUser, Kirby\Cms\User $oldUser) {
            // your code goes here
        }
    ]
]Parameters
| Parameter | Type | 
|---|---|
| $newUser | Kirby\Cms\User | 
| $oldUser | Kirby\Cms\User |