function updateClassName(element, currentLang, resultLang) {
      const language = (currentLang && aliases[currentLang]) || resultLang;

      element.classList.add("hljs");
      element.classList.add(`language-${language}`);
    }
Builds new class name for block given the language name

@param {HTMLElement} element
@param {string} [currentLang]
@param {string} [resultLang]