Prepare Translation strings

[natsukagami]

• User UI:
  • Common items (sidebar, copyright)
  • /user (Login and User Panel)
  • Contest UI:
    • Overview and Scoreboard
    • Problem view
• Admin UI:
  • Common items (sidebar)
  • Overview
  • Contests (listing, edit, scoreboard, announcements)
  • Problems (listing, edit)
  • Jobs
• Frontend JS
• Backend:
  • httperr messages:
    • Verify
    • /user and /contests
    • /admin
  • Logs