[FIX] update ui hints

mail_private/static/src/xml/mail_private.xml

@@ -2,7 +2,20 @@
 <template>
     <t t-extend="mail.compose_message">
 		<t t-jquery="a[title='Send a message to all followers of the document']" t-operation="after">
-			<span class="oe_grey oe_sep_word">or</span><a class="oe_compose_post_private" t-if="!widget.options.compose_placeholder and !widget.options.view_mailbox" title="Send a message to all followers of the document">Send internal message</a>
+			<span class="oe_grey oe_sep_word">or</span><a class="oe_compose_post_private" t-if="!widget.options.compose_placeholder and !widget.options.view_mailbox" title="Send a message to specified recipients only">Send internal message</a>
 		</t>
 	</t>
+  <t t-extend="mail.thread.list_recipients">
+      <t t-jquery="[t-if='!widget.is_private']" t-operation="replace">
+            <t t-if="!widget.is_private and !widget.private">
+                <span class="oe_all_follower">
+                    <t t-if="widget.parent_thread.parent_message.record_name">
+                        Followers of <t t-raw="'&quot;' + widget.parent_thread.parent_message.record_name + '&quot;'"/>
+                    </t>
+                    <t t-if="!widget.parent_thread.parent_message.record_name and widget.options.view_inbox">My Followers</t>
+                    <t t-if="!widget.parent_thread.parent_message.record_name and !widget.options.view_inbox">Followers of this document</t>
+                </span>
+            </t>
+      </t>
+  </t>
 </template>