$(document).ready(function () {
  $('.hint').tooltip();
  $('.language-text-area').each(function () {
    auto_grow(this);
  });
  $('.language-text-area').keyup(function () {
    auto_grow(this);
  });
});

function auto_grow (element) {
  element.style.height = '5px';
  element.style.height = (element.scrollHeight + 10) + 'px';
}