update to bootstrap 4

templates/includes/form.html

@@ -0,0 +1,26 @@
+{% load form_tags widget_tweaks %}
+
+{% if form.non_field_errors %}
+    <div class="alert alert-danger" role="alert">
+        {% for error in form.non_field_errors %}
+            <p{% if forloop.last %} class="mb-0"{% endif %}>{{ error }}</p>
+        {% endfor %}
+    </div>
+{% endif %}
+
+{% for field in form %}
+    <div class="form-group">
+        {{ field.label_tag }}
+        {% render_field field class=field|input_class %}
+        {% for error in field.errors %}
+            <div class="invalid-feedback">
+                {{ error }}
+            </div>
+        {% endfor %}
+        {% if field.help_text %}
+            <small class="form-text text-muted">
+                {{ field.help_text|safe }}
+            </small>
+        {% endif %}
+    </div>
+{% endfor %}