Read only wordlist page and a lot of changes:

  - introduce read only wordlist page;
  - update header for all files and create file COPYING in order to be compliant with GNU guidelines (see https://www.gnu.org/licenses/gpl-2.0.html and https://www.gnu.org/licenses/gpl-2.0.html and https://www.gnu.org/licenses/gpl-howto.en.html);
  - create file AUTHORS;
  - javascript: save in external files, beautify and little fix;
  - convert ddtss/index.html table in datatable;
  - replace "-" character in html file name with "_" in order to be consistent;
  - all external link open in new empty tab, added target="_blank";
  - fix logging (see comment on pull request #13);
  - use wordlist in translation/review phase;
  - drop tt HTML element (see http://www.w3.org/wiki/HTML/Elements/tt);
  - save wordlist in CSV file via JavaScript;
  - string on message sent;
  - CSS and style revision.