Shorter text for the call form and input field now required

templates/home.html

@@ -33,11 +33,10 @@
                         <h5>{{ _("Call for free") }}</h5>
                         <form id="form-contact" method="post" action="">
                             <input type="text" id="contact_id" name="contact_id" hidden="hidden" value="">
-                            <p>{{ _("If you want to call for free, you must provide us with your phone number 
-                            (the PiPhone will call that number to initiate the communication).") }}</p>
+                            <p>{{ _("We need your phone number to initiate the call") }}</p>
                             <div class="input-field col s12">
                                 <label for="phone">{{_("Your phone number:") }}</label>
-                                <input type="text" name="phone" id="phone" />
+                                <input type="text" name="phone" required id="phone" />
                             </div>
                             <p>
                             {{ _('Starting with your <a href="https://en.wikipedia.org/wiki/List_of_country_calling_codes#Zones_3-4:_Europe">country code</a>, without the initial 0') }}