Revert unnecessary change.

biscuit/apps/alsijil/templates/alsijil/group_week.html

@@ -23,7 +23,7 @@
         <div class="card">
           <div class="card-header bg-light text-dark">
             {% blocktrans %}Week{% endblocktrans %}
-            {{ week }} ({{ week|week_start }} — {{ week|week_end }}),
+            {{ week }} ({{ week|week_start }} - {{ week|week_end }}),
             {{ group.name }}
           </div>
           <div class="card-body">