.language {
	position: fixed;
	margin: 100px;
}
.language input {
	display: none;
}

.language input:not(:checked) + label #fr {
	display: inline;
}
.language input:not(:checked) + label #en {
	display: none;
}
.language:has(input:not(:checked)) ~ * span.en {
	display: none;
}

.language input:checked + label #fr {
	display: none;
}
.language input:checked + label #en {
	display: inline;
}
.language:has(input:checked) ~ * span.fr {
	display: none;
}