Access url for interventions

* adds access_token as new attribute
* adds generating of access_token
* adds new form
* adds two new routes for sharing an intervention
* adds translation
* adds render_submit to BaseModalForm which triggers rendering the modal footer

intervention/templates/intervention/detail/view.html

@@ -24,11 +24,9 @@
                     </button>
                 </a>
                 {% if has_access %}
-                <a href="{% url 'home' %}" class="mr-2">
-                    <button class="btn btn-default" title="{% trans 'Share' %}">
-                        {% fa5_icon 'share-alt' %}
-                    </button>
-                </a>
+                <button class="btn btn-default btn-modal mr-2" title="{% trans 'Share' %}" data-form-url="{% url 'intervention:share-create' intervention.id %}">
+                    {% fa5_icon 'share-alt' %}
+                </button>
                 <a href="{% url 'home' %}" class="mr-2">
                     <button class="btn btn-default" title="{% trans 'Run check' %}">
                         {% fa5_icon 'star' %}