port forward: the off switch gets a checkbox in Settings → General

`enable-port-forward-mux` was readable only by editing the config file.
It is a local setting of the controlling side, so it sits with the other
outgoing ones, after "Open connection in new tab", with a tooltip saying
what it does.

The two new keys are translated in every language. The three that the
mobile file manager added, "Export", "Export Logs" and "Import Folder",
were empty everywhere but five languages; they are filled in too, and
Korean's "xdp-portal-unavailable" with them.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EZ49AbZJYfm8NTp5yDPMab

src/lang/ca.rs

@@ -659,9 +659,9 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("screenshot-merged-screen-not-supported-tip", "Actualment no és possible combinar captures de pantalla de diverses pantalles. Canvieu a una sola pantalla i torneu a provar."),
         ("screenshot-action-tip", "Seleccioneu com voleu continuar amb la captura de pantalla."),
         ("Save as", "Anomena i desa"),
-        ("Export", ""),
-        ("Export Logs", ""),
-        ("Import Folder", ""),
+        ("Export", "Exporta"),
+        ("Export Logs", "Exporta els registres"),
+        ("Import Folder", "Importa una carpeta"),
         ("Copy to clipboard", "Copia al porta-retalls"),
         ("Enable remote printer", "Habilita l'impressora remota"),
         ("Downloading {}", "Descarregant {}"),
@@ -763,5 +763,7 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Lock canvas", "Bloca el llenç"),
         ("Sync clipboard between sessions", "Sincronitza el porta-retalls entre sessions"),
         ("sync-clipboard-between-sessions-tip", "El text o les imatges copiats en una sessió remota també s'envien al porta-retalls de les altres sessions connectades."),
+        ("Reuse one connection for port forwarding", "Reutilitza una connexió per a la redirecció de ports"),
+        ("port-forward-mux-tip", "Fa passar totes les connexions d'una redirecció de ports per una única connexió amb l'altre equip, en lloc de connectar i iniciar la sessió de nou per a cadascuna."),
     ].iter().cloned().collect();
 }