erp5_credential: change proxy role that can update assignment

bt5/erp5_credential/SkinTemplateItem/portal_skins/erp5_credential/CredentialRequest_updatePersonAssignment.xml

@@ -51,7 +51,7 @@
         <item>
             <key> <string>_body</string> </key>
             <value> <string>"""Create an assignment for the person depending credential request configuration\n
-Proxy: Assignee -- allow to update the related assignment"""\n
+Proxy: Assignor -- allow to update the related assignment"""\n
 \n
 # check the script is not called from a url\n
 if REQUEST is not None:\n
@@ -121,7 +121,7 @@ for role in context.getRoleList():\n
             <key> <string>_proxy_roles</string> </key>
             <value>
               <tuple>
-                <string>Assignee</string>
+                <string>Assignor</string>
                 <string>Owner</string>
               </tuple>
             </value>