Remove final vestiges of clipboard-list being part of the icon font

client/scss/components/_messages.scss

@@ -66,12 +66,6 @@
     .errorlist {
         margin: 0.5em 0 0 1em;
     }
-
-    .workflow {
-        &:before {
-            content: map-get($icons, 'clipboard-list');
-        }
-    }
 }
 
 .messages.new > ul {

client/scss/settings/_variables.icons.scss

@@ -9,7 +9,6 @@ $icons: (
     'bin': '\e038',
     'bold': '\e026',
     'chain-broken': '\e047',
-    'clipboard-list': '\e900',
     'code': '\e001',
     'cog': '\e020',
     'cogs': '\e00c',

wagtail/admin/templates/wagtailadmin/pages/workflow_history/detail.html

@@ -8,13 +8,13 @@
     {% include "wagtailadmin/shared/header.html" with title=title_str %}
 
     <div class="nice-padding">
-        <h2 class="icon icon-doc-empty-inverse">{{ page.get_admin_display_title }}</h2>
+        <h2>{% icon "doc-empty-inverse" class_name="initial" %} {{ page.get_admin_display_title }}</h2>
         <p>
             <a href="{% url 'wagtailadmin_pages:edit' page.id %}" class="button button-small button-secondary">{% trans "Edit / Review" %}</a>
             <a href="{% url 'wagtailadmin_pages:workflow_history' page.id %}" class="button button-small button-secondary">{% trans "Workflow history" %}</a>
         </p>
 
-        <h2 class="icon icon-clipboard-list">{{ workflow_state.workflow.name }}</h2>
+        <h2>{% icon "clipboard-list" class_name="initial" %} {{ workflow_state.workflow.name }}</h2>
 
         <p>
             {% blocktrans with modified_by=workflow_state.requested_by.get_full_name|default:workflow_state.requested_by.get_username %}Requested by <b>{{ modified_by }}</b>{% endblocktrans %}