Provide feedback to the form when repatcha fails

[enzedonline]

If the recaptcha fails, the form is returned without any indication of what the error was (testing with V3, required score 10).

Perhaps an error can be added to the form non_field_errors so that it can be picked up in the template, along the lines of

          {% if form.non_field_errors %}
            <div class="alert alert-danger" role="alert">
              {% for error in form.non_field_errors %}{{ error }}{% endfor %}
            </div>
          {% endif %}

Not sure what the best way would be to handle that message generically for multilingual sites however.