ItemStack is = player.getInventory().getItemInMainHand();
System.out.println("output= " + is.getItemMeta().getLocalizedName());

Initial commit of this method here.

Tested with Apple, String, Dirt using English (US), Spanish (Mexico), Korean.

From what I understand, is.getItemMeta().getLocalizedName() should return the localized/translated name of a given item (such as "Terra" instead of "Dirt" for Spanish (Mexico) users. Instead the output is always "output= null".