Restored the "Back" button on the toolbar for the mobile devices. It is still necessary, because the user may get lost in the navigation history.

src/accounting/templates/accounting/base-account/detail.html

@@ -25,10 +25,10 @@ First written: 2023/2/1
 
 {% block content %}
 
-<div class="mb-3 d-none d-md-block">
+<div class="mb-3 accounting-toolbar">
   <a class="btn btn-primary" href="{{ url_for("accounting.account.list")|accounting_or_next }}">
     <i class="fa-solid fa-circle-chevron-left"></i>
-    {{ A_("Back") }}
+    <span class="d-none d-md-inline">{{ A_("Back") }}</span>
   </a>
 </div>