.it { display: none; }
[data-lang="it"] .en { display: none; }
[data-lang="it"] .it { display: inline; }
[data-lang="it"] h1.it,
[data-lang="it"] h2.it,
[data-lang="it"] h3.it,
[data-lang="it"] p.it,
[data-lang="it"] small.it { display: block; }