Fix admin site - Custom admin URL (#5766)

* Update config template file

* Add entry to docs

* Add INVENTREE_ADMIN_ENABLED to settings.py

* Add helper functions for improving admin links

* Refactor existing admin links

* remove debug statements

* Fix custom admin URL

* Expand documentation

* Fix URL

* Improve wording in config_template.yaml

* Extend admin_url tag

- Allow lookup without pk
- Handle case where pk not found

InvenTree/templates/InvenTree/settings/plugin.html

@@ -35,7 +35,7 @@
         <h4>{% trans "Plugins" %}</h4>
         {% include "spacer.html" %}
         <div class='btn-group' role='group'>
-            {% url 'admin:plugin_pluginconfig_changelist' as url %}
+            {% admin_url user "plugin.pluginconfig" None as url %}
             {% include "admin_button.html" with url=url %}
             {% if plug %}
             <button class="btn btn-success" id="install-plugin" title="{% trans 'Install Plugin' %}"><span class='fas fa-plus-circle'></span> {% trans "Install Plugin" %}</button>

InvenTree/templates/admin_button.html

@@ -3,7 +3,7 @@
 
 {% inventree_customize 'hide_admin_link' as hidden %}
 
-{% if not hidden and user.is_staff %}
+{% if url and not hidden and user.is_staff %}
 <a href='{{ url }}'>
     <button id='admin-button' href='{{ url }}' title='{% trans "View in administration panel" %}' type='button' class='btn btn-primary admin-button'>
         <span class='fas fa-user-shield'></span>

InvenTree/templates/navbar.html

@@ -139,7 +139,10 @@
         <ul class='dropdown-menu dropdown-menu-end inventree-navbar-menu'>
           {% if user.is_authenticated %}
           {% if user.is_staff and not hide_admin_link %}
-          <li><a class='dropdown-item' href="{% url 'admin:index' %}"><span class="fas fa-user-shield"></span> {% trans "Admin" %}</a></li>
+          {% admin_index user as admin_idx %}
+          {% if admin_idx %}
+          <li><a class='dropdown-item' href="{{ admin_idx }}"><span class="fas fa-user-shield"></span> {% trans "Admin" %}</a></li>
+          {% endif %}
           {% endif %}
           <li><a class='dropdown-item' href="{% url 'settings' %}"><span class="fas fa-cog"></span> {% trans "Settings" %}</a></li>
           <li><a class='dropdown-item' href="{% url 'account_logout' %}"><span class="fas fa-sign-out-alt"></span> {% trans "Logout" %}</a></li>

InvenTree/templates/registration/logged_out.html

@@ -1,10 +1,11 @@
 {% extends "registration/logged_out.html" %}
 {% load i18n %}
+{% load inventree_extras %}
 
 {% block content %}
 
 <p>{% translate "You were logged out successfully." %}</p>
 
-<p><a href="{% url 'admin:index' %}">{% translate 'Log in again' %}</a></p>
+<p><a href="{% url 'index' %}">{% translate 'Log in again' %}</a></p>
 
 {% endblock content %}