Preferred timezone should be a user preference.

Note that after applying this change it's important to clear preferred timezone
for system preferences, as they have priority over user preferences

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/Preference_viewHtmlStyle.xml

@@ -78,6 +78,7 @@
                     <value>
                       <list>
                         <string>my_preferred_date_order</string>
+                        <string>my_preferred_time_zone</string>
                         <string>my_preferred_html_style_unsaved_form_warning</string>
                         <string>my_preferred_html_style_developper_mode</string>
                         <string>my_preferred_html_style_contextual_help</string>

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/SystemPreference_view/my_preferred_time_zone.xml → product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/Preference_viewHtmlStyle/my_preferred_time_zone.xml

@@ -10,10 +10,9 @@
             <key> <string>delegated_list</string> </key>
             <value>
               <list>
-                <string>title</string>
                 <string>description</string>
-                <string>default</string>
                 <string>items</string>
+                <string>title</string>
               </list>
             </value>
         </item>
@@ -55,12 +54,6 @@
             <key> <string>tales</string> </key>
             <value>
               <dictionary>
-                <item>
-                    <key> <string>default</string> </key>
-                    <value>
-                      <persistent> <string encoding="base64">AAAAAAAAAAI=</string> </persistent>
-                    </value>
-                </item>
                 <item>
                     <key> <string>description</string> </key>
                     <value> <string></string> </value>
@@ -76,7 +69,7 @@
                 <item>
                     <key> <string>items</string> </key>
                     <value>
-                      <persistent> <string encoding="base64">AAAAAAAAAAM=</string> </persistent>
+                      <persistent> <string encoding="base64">AAAAAAAAAAI=</string> </persistent>
                     </value>
                 </item>
                 <item>
@@ -94,10 +87,6 @@
             <key> <string>values</string> </key>
             <value>
               <dictionary>
-                <item>
-                    <key> <string>default</string> </key>
-                    <value> <string></string> </value>
-                </item>
                 <item>
                     <key> <string>description</string> </key>
                     <value> <string>Preferred timezone</string> </value>
@@ -131,19 +120,6 @@
     </pickle>
   </record>
   <record id="2" aka="AAAAAAAAAAI=">
-    <pickle>
-      <global name="TALESMethod" module="Products.Formulator.TALESField"/>
-    </pickle>
-    <pickle>
-      <dictionary>
-        <item>
-            <key> <string>_text</string> </key>
-            <value> <string>python: here.getPreferredTimeZone() or preferences.getPreferredTimeZone()</string> </value>
-        </item>
-      </dictionary>
-    </pickle>
-  </record>
-  <record id="3" aka="AAAAAAAAAAM=">
     <pickle>
       <global name="TALESMethod" module="Products.Formulator.TALESField"/>
     </pickle>

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/SystemPreference_view.xml

@@ -83,7 +83,6 @@
                     <value>
                       <list>
                         <string>my_priority</string>
-                        <string>my_preferred_time_zone</string>
                         <string>my_preferred_ooodoc_server_address</string>
                         <string>my_preferred_ooodoc_server_port_number</string>
                         <string>my_preferred_ooodoc_server_timeout</string>