Revise dialog messages

Using critical dialog is a bit too strong as qbt didn't actually run
into something that fails, so downgrade to warning dialog.

src/gui/addnewtorrentdialog.cpp

@@ -296,16 +296,16 @@ bool AddNewTorrentDialog::loadTorrent(const QString &torrentPath)
         BitTorrent::TorrentHandle *const torrent = BitTorrent::Session::instance()->findTorrent(m_hash);
         if (torrent) {
             if (torrent->isPrivate() || m_torrentInfo.isPrivate()) {
-                RaisedMessageBox::critical(this, tr("Already in the download list"), tr("Torrent '%1' is already in the download list. Trackers weren't merged because it is a private torrent.").arg(torrent->name()), QMessageBox::Ok);
+                RaisedMessageBox::warning(this, tr("Torrent is already present"), tr("Torrent '%1' is already in the transfer list. Trackers haven't been merged because it is a private torrent.").arg(torrent->name()), QMessageBox::Ok);
             }
             else {
                 torrent->addTrackers(m_torrentInfo.trackers());
                 torrent->addUrlSeeds(m_torrentInfo.urlSeeds());
-                RaisedMessageBox::information(this, tr("Already in the download list"), tr("Torrent '%1' is already in the download list. Trackers were merged.").arg(torrent->name()), QMessageBox::Ok);
+                RaisedMessageBox::information(this, tr("Torrent is already present"), tr("Torrent '%1' is already in the transfer list. Trackers have been merged.").arg(torrent->name()), QMessageBox::Ok);
             }
         }
         else {
-            RaisedMessageBox::critical(this, tr("Cannot add torrent"), tr("Cannot add this torrent. Perhaps it is already in adding state."), QMessageBox::Ok);
+            RaisedMessageBox::information(this, tr("Torrent is already present"), tr("Torrent is already queued for processing."), QMessageBox::Ok);
         }
         return false;
     }
@@ -330,16 +330,16 @@ bool AddNewTorrentDialog::loadMagnet(const BitTorrent::MagnetUri &magnetUri)
         BitTorrent::TorrentHandle *const torrent = BitTorrent::Session::instance()->findTorrent(m_hash);
         if (torrent) {
             if (torrent->isPrivate()) {
-                RaisedMessageBox::critical(this, tr("Already in the download list"), tr("Torrent '%1' is already in the download list. Trackers weren't merged because it is a private torrent.").arg(torrent->name()), QMessageBox::Ok);
+                RaisedMessageBox::warning(this, tr("Torrent is already present"), tr("Torrent '%1' is already in the transfer list. Trackers haven't been merged because it is a private torrent.").arg(torrent->name()), QMessageBox::Ok);
             }
             else {
                 torrent->addTrackers(magnetUri.trackers());
                 torrent->addUrlSeeds(magnetUri.urlSeeds());
-                RaisedMessageBox::information(this, tr("Already in the download list"), tr("Magnet link '%1' is already in the download list. Trackers were merged.").arg(torrent->name()), QMessageBox::Ok);
+                RaisedMessageBox::information(this, tr("Torrent is already present"), tr("Magnet link '%1' is already in the transfer list. Trackers have been merged.").arg(torrent->name()), QMessageBox::Ok);
             }
         }
         else {
-            RaisedMessageBox::critical(this, tr("Cannot add torrent"), tr("Cannot add this torrent. Perhaps it is already in adding."), QMessageBox::Ok);
+            RaisedMessageBox::information(this, tr("Torrent is already present"), tr("Magnet link is already queued for processing."), QMessageBox::Ok);
         }
         return false;
     }