server/tags: merge also tag relations

client/html/tag_merge.tpl

@@ -1,14 +1,14 @@
 <div class='tag-merge'>
     <form>
-        <p>Proceeding will remove this tag and retag its posts with the tag
-        specified below. Aliases, suggestions and implications are discarded
-        and need to be handled manually.</p>
-
         <ul>
             <li class='target'>
                 <%= ctx.makeTextInput({required: true, text: 'Target tag', pattern: ctx.tagNamePattern}) %>
             </li>
-            <li class='confirm'>
+
+            <li>
+                <p>Usages in posts, suggestions and implications will be
+                merged. Category and aliases need to be handled manually.</p>
+
                 <%= ctx.makeCheckbox({required: true, text: 'I confirm that I want to merge this tag.'}) %>
             </li>
         </ul>