[collector views] prominently display Teil number

TODO.txt

@@ -1,6 +1,6 @@
 [x] export data
 [x] import exported data
-[ ] display Teil-number
+[x] display Teil-number
 [ ] export CSV/excel/markdown for printing
 [x] split requirements into prod, test, dev
 [ ] improve handling of settings for prod, test, and dev: avoid all those if statements

collector/templates/collector/detail.html

@@ -1,2 +1,2 @@
-<h1>{{ teil.name }}</h1>
+<h1>[{{ teil.id }}] {{ teil.name }}</h1>
 Last Changed: {{ teil.modified }}

collector/templates/collector/index.html

@@ -4,7 +4,7 @@
     {% for teil in teile_list %}
     <li>
       <a href="{% url 'collector:detail' teil.id %}">
-        {{ teil.name }}
+        <strong>[{{ teil.id }}]</strong> {{ teil.name }}
       </a> ({{ teil.modified }})
     </li>
     {% endfor %}