Refactor admin button for:

- build order
- part detail
- stock item
- stock location
- company detail
- manufacturer-part
- purchase order
- sales order

InvenTree/templates/admin_button.html

@@ -0,0 +1,4 @@
+{% load i18n %}
+<button id='admin-button' title='{% trans "View in administration panel" %}' type='button' class='btn btn-primary' url='{{ url }}'>
+    <span class='fas fa-user-shield'></span>
+</button>

InvenTree/templates/js/dynamic/inventree.js

@@ -190,6 +190,13 @@ function inventreeDocReady() {
     $('.brand-icon').each(function(i, obj) {
         loadBrandIcon($(this), $(this).attr('brand_name'));
     });
+
+    // Callback for "admin view" button
+    $('#admin-button').click(function() {
+        var url = $(this).attr('url');
+
+        location.href = url;
+    });
 }
 
 function isFileTransfer(transfer) {

InvenTree/templates/page_base.html

@@ -6,6 +6,21 @@
 {% block content %}
 
 <div class='panel'>
+    <div class='panel-heading'>
+        <div class='d-flex flex-row'>
+            <h4>
+                {% block heading %}
+                <i>-- page header goes here --</i>
+                {% endblock %}
+            </h4>
+            <span class='flex' style='flex-grow: 1;'></span>
+            <div id='page-actions' class='btn-group' role='group'>
+                {% block actions %}
+                <i>-- actions go here --</i>
+                {% endblock %}
+            </div>
+        </div>
+    </div>
     <div class='panel-content'>
         <div class='row'>
             <div class='col-sm-6' id='detail-panel-left'>