[web] return 403 for Unauthorized, not 401
401 is reserved to HTTP authentication. Just because it's also called
"unauthorized" doesn't mean it's the same as cubicweb's Unauthorized
exception. Closes #3648809.
<table class="attributeForm" style="width:100%;" tal:attributes="id tab_id | nothing; class tab_class | nothing;"> <tr tal:iter="widget lines"> <th class="labelCol" tal:content="structure python:widget.render_label(entity)">attrname</th> <td tal:define="error python:widget.render_error(entity)" style="width:100%;" tal:attributes="class python:error and 'error' or nothing"> <div tal:replace="structure error">error message if any</div> <div tal:replace="structure python:widget.edit_render(entity)" >widget (input, textarea, etc.)</div> <div tal:replace="structure python:widget.render_help(entity)">format help if any</div> </td> </tr> </table>