Imho, labels in the CSS are pretty tricky for i18n. The colors doesn't (generally), need traductions, they have the same meaning whatever the language. Data at

Imho, labels in the CSS are pretty tricky for i18n. The colors doesn't (generally), need traductions, they have the same meaning whatever the language. Data attributes in another hand, despite of being a bit redondant (in fact, it's not that insane in a loop ^^'), can be easily translated in HTML.