officejs_support_request_ui: use new panel icons

 * Preferences use same icons as other OfficeJS apps
 * Support Request use an "help"/"support" icon

bt5/erp5_officejs_support_request_ui/PathTemplateItem/web_page_module/gadget_supportrequest_panel_html.html

@@ -37,8 +37,8 @@
 
         <ul data-role="listview" class="ui-listview" data-enhanced="true">
           <li class="ui-first-child"><a href="#" class="ui-btn ui-btn-icon-left ui-icon-home" data-i18n="Home">Home</a></li>
-          <li><a href="{{supportrequest_href}}" class="ui-btn ui-btn-icon-left ui-icon-gear" data-i18n="Support Requests">Support Requests</a></li>
-          <li><a href="{{preference_href}}" class="ui-btn ui-btn-icon-left ui-icon-gear" data-i18n="Preferences">Preferences</a></li>
+          <li><a href="{{supportrequest_href}}" class="ui-btn ui-btn-icon-left ui-icon-life-ring" data-i18n="Support Requests">Support Requests</a></li>
+          <li><a href="{{preference_href}}" class="ui-btn ui-btn-icon-left ui-icon-sliders" data-i18n="Preferences">Preferences</a></li>
           <li class="ui-last-child"><a href="{{logout_href}}" class="ui-btn ui-btn-icon-left ui-icon-power-off" data-i18n="Logout" accesskey="o">Logout</a></li>
         </ul>
         <dl></dl>

[Jérome Perrin]

I dont' like so much this icon and believe https://fontawesome.com/icons/hands-helping?style=solid&from=io or https://fontawesome.com/icons/handshake?style=regular&from=io would be more appropriate, but this would require us to upgrade to fontawesome 5 .

Apparently there are upgrade notes to follow https://fontawesome.com/how-to-use/on-the-web/setup/upgrading-from-version-4 so maybe we should include both with and start including the version number in the URL from version 5.