message: Remove obsolete strings
  (from manual continue code save/restore on score board)
diff: "STATUS_SOLVED":"solved",
  "CALL_FOR_CONTRIBUTIONS":"Got an idea for a new challenge? Found a vulnerability that is not tracked here? Let us know via {{gitter}} community chat or by opening a {{github}} issue!",
  "CHALLENGE_SOLVED": "You successfully solved a challenge: {{challenge}}",
  - "LABEL_HACKING_SESSION": "Your Hacking Session",
  - "CONTINUE_PREVIOUS_SESSION": "Conveniently save your hacking progress to restore it later.",
  - "BTN_SAVE_PROGRESS": "Save Progress",
  - "BTN_RESTORE_PROGRESS": "Restore Progress",
  - "CURRENT_CONTINUE_CODE": "Your current continue code:",
  "INVALID_CONTINUE_CODE": "Invalid continue code.",
  "CONFIRM_LOGGED_IN_VIA_OAUTH2": "You have been logged in via OAuth 2.0 provider.",
  "HOME_LINK_MESSAGE": "If you are not automatically redirected, please click here: {{home}}",
  