Show "Message" in the user info panel instead of "Start chat"

src/components/views/right_panel/UserInfo.tsx

@@ -428,7 +428,7 @@ const UserOptionsSection: React.FC<{
     if (!isMe) {
         directMessageButton = (
             <AccessibleButton onClick={() => openDMForUser(cli, member.userId)} className="mx_UserInfo_field">
-                { _t('Direct message') }
+                { findDMForUser(cli, member.userId) ? _t("Open chat") : _t('Direct message') }
             </AccessibleButton>
         );
     }

src/i18n/strings/en_EN.json

@@ -1784,6 +1784,7 @@
     "Mention": "Mention",
     "Invite": "Invite",
     "Share Link to User": "Share Link to User",
+    "Open chat": "Open chat",
     "Direct message": "Direct message",
     "Demote yourself?": "Demote yourself?",
     "You will not be able to undo this change as you are demoting yourself, if you are the last privileged user in the space it will be impossible to regain privileges.": "You will not be able to undo this change as you are demoting yourself, if you are the last privileged user in the space it will be impossible to regain privileges.",