refactor(bulma): add announcement template

src/fellchensammlung/templates/fellchensammlung/partials/bulma-partial-announcement.html

@@ -0,0 +1,12 @@
+{% load i18n %}
+{% load custom_tags %}
+<article class="message {{ announcement.type|type_to_bulma_class }}">
+    <div class="message-header">
+        <p>{{ announcement.title }}</p>
+        <button class="delete" aria-label="delete"></button>
+    </div>
+    <div class="message-body content">
+        {{ announcement.content | render_markdown }}
+    </div>
+
+</article>

src/fellchensammlung/templatetags/custom_tags.py

@@ -84,3 +84,15 @@ def add_class(field, css_class):
 @register.filter
 def widget_type(field):
     return field.field.widget.__class__.__name__
+
+
+@register.filter
+def type_to_bulma_class(value):
+    if value == "info":
+        return "is-info"
+    elif value == "warning":
+        return "is-warning"
+    elif value == "important":
+        return "is-danger"
+    else:
+        return value