fix(form_translation): form serilization problem with rich text

Signed-off-by: Thierry Bugier <tbugier@teclib.com>

js/scripts.js.php

@@ -1148,6 +1148,7 @@ function buildTiles(list) {
    this.saveNewTranslation = function () {
       var that = this;
       var form = document.querySelector('form[name="plugin_formcreator_translation"]');
+      tinyMCE.triggerSave();
       $.ajax({
          url: '../ajax/translation.php',
          type: 'POST',