tag-transaltor.js

const translator = {
  "Hello": "Hola"
};

function spanish(strings, ...values) {
  return strings.reduce(function(str, val, idx) {
    return str + (idx > 0 ? translator[values[idx - 1]] : '') + val;
  }, '');
}

const phrase = "Hello";
console.log(
  spanish`The word for Hello is ${phrase}`
);