Validation: add email-validator + phonenumbers; improve server-side validation; add tests; update templates and requirements

templates/index.html

@@ -20,6 +20,9 @@
         <label>Land <input name="land" value="{{ form.land if form and form.land else 'Deutschland' }}"></label>
         <label>Telefon Vorwahl <input name="telefon_vorwahl" value="{{ form.telefon_vorwahl if form and form.telefon_vorwahl }}"></label>
         <label>Telefon Nummer <input name="telefon_nummer" value="{{ form.telefon_nummer if form and form.telefon_nummer }}"></label>
+        {% if errors and errors.telefon %}
+          <div style="color:red">{{ errors.telefon }}</div>
+        {% endif %}
         <label>E-Mail <input name="email" type="email" value="{{ form.email if form and form.email }}"> {% if errors and errors.email %}<strong style="color:red">{{ errors.email }}</strong>{% endif %}</label>
       </fieldset>