feat: conversation participants (#4145)

Fixes #241
Fixes: chatwoot/product#648

Co-authored-by: Aswin Dev P.S <aswindevps@gmail.com>
Co-authored-by: Nithin David Thomas <1277421+nithindavid@users.noreply.github.com>
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
Co-authored-by: Pranav Raj S <pranav@chatwoot.com>

app/javascript/dashboard/components/ChatList.vue

@@ -377,6 +377,9 @@ export default {
       if (this.conversationType === 'mention') {
         return this.$t('CHAT_LIST.MENTION_HEADING');
       }
+      if (this.conversationType === 'participating') {
+        return this.$t('CONVERSATION_PARTICIPANTS.SIDEBAR_MENU_TITLE');
+      }
       if (this.conversationType === 'unattended') {
         return this.$t('CHAT_LIST.UNATTENDED_HEADING');
       }