Support EventShieldReason.MISMATCHED_SENDER (#30403)

The js-sdk now exposes a new event shield reason, which we should handle
correctly.

src/components/views/rooms/EventTile.tsx

@@ -757,6 +757,10 @@ export class UnwrappedEventTile extends React.Component<EventTileProps, IState>
                     shieldReasonMessage = _t("timeline|decryption_failure|sender_identity_previously_verified");
                     break;
 
+                case EventShieldReason.MISMATCHED_SENDER:
+                    shieldReasonMessage = _t("encryption|event_shield_reason_mismatched_sender");
+                    break;
+
                 default:
                     shieldReasonMessage = _t("error|unknown");
                     break;

src/i18n/strings/en_EN.json

@@ -934,6 +934,7 @@
         "cross_signing_user_warning": "This user has not verified all of their sessions.",
         "enter_recovery_key": "Enter recovery key",
         "event_shield_reason_authenticity_not_guaranteed": "The authenticity of this encrypted message can't be guaranteed on this device.",
+        "event_shield_reason_mismatched_sender": "The sender of the event does not match the owner of the device that sent it.",
         "event_shield_reason_mismatched_sender_key": "Encrypted by an unverified session",
         "event_shield_reason_unknown_device": "Encrypted by an unknown or deleted device.",
         "event_shield_reason_unsigned_device": "Encrypted by a device not verified by its owner.",