web: use password i18n placeholder

lang/main.json

         "muteParticipantDialog": "Are you sure you want to mute this participant? You won't be able to unmute them, but they can unmute themselves at any time.",
         "muteParticipantTitle": "Mute this participant?",
         "Ok": "Ok",
-        "passwordLabel": "The meeting has been locked by a participant. Please enter the password to join.",
+        "passwordLabel": "The meeting has been locked by a participant. Please enter the $t(lockRoomPassword) to join.",
         "passwordNotSupported": "Setting a meeting $t(lockRoomPassword) is not supported.",
         "passwordNotSupportedTitle": "$t(lockRoomPasswordUppercase) not supported",
         "passwordRequired": "$t(lockRoomPasswordUppercase) required",