Add report reopening and message for reopening a report (#1550)

components/ui/thread/ThreadMessage.vue

@@ -72,6 +72,7 @@
         </span>
       </template>
       <span v-else-if="message.body.type === 'thread_closure'">closed the thread.</span>
+      <span v-else-if="message.body.type === 'thread_reopen'">reopened the thread.</span>
     </div>
     <span class="message__date">
       <span v-tooltip="$dayjs(message.created).format('MMMM D, YYYY [at] h:mm A')">