title: Change alert message depending on language?
body: <p>I have created a newsletter pop-out feature, that allows the user to sign up to a newsletter that is sent out, there is a alert message if the user tries to click on submit without entering an email address first, however i need this message/alert to be changed according to the country they are on, for example if they are on the Italian site, i would need this message to be in Italian, my current code is:</p>
  
  <pre><code>this.signup = function() {
      if ($('#emailsignup').val() == '') {
         alert('Bitte geben Sie eine gültige E-Mail Adresse ein.');
       } else {
             $.ajax({
                dataType: 'jsonp',
                data: {
                      e: $('#emailsignup').val(),
                      s: 'leftsideform',
                      c:  that.lang
                      },
                      jsonp: 'jsonp_callback',
                      url: 'http://karina.com/######',
                      success: function (response) {
                          if (response.success === true) {
                              $('#emailsignup').val('');
                          }
                          if (response.callback.data != '') {
                               alert(response.callback.data);
                          }
                      }
             });
      }
  }
  </code></pre>