Resolve "Frontend for DashboardWidget creation"

Closes #314 (closed)

Important: Doesn't include support for ordering or sizing yet. These things will be solved in #191 (closed).

aleksis/core/templates/core/dashboard_widget/create.html

+{# -*- engine:django -*- #}
+
+{% extends "core/base.html" %}
+{% load material_form i18n data_helpers %}
+
+{% block browser_title %}
+  {% verbose_name_object model as widget_title %}
+  {% blocktrans with widget=widget_title %}Create {{ widget }}{% endblocktrans %}
+{% endblock %}
+{% block page_title %}
+  {% verbose_name_object model as widget_title %}
+  {% blocktrans with widget=widget_title %}Create {{ widget }}{% endblocktrans %}
+{% endblock %}
+
+{% block content %}
+
+  <form method="post">
+    {% csrf_token %}
+    {% form form=form %}{% endform %}
+    {% include "core/partials/save_button.html" %}
+  </form>
+
+{% endblock %}