i18n: fix typo for CONFIRM_SECRET

[liubin]

Thank you for contributing to Harbor!

Comprehensive Summary of your change

Issue being fixed

Fixes #(issue)

Please indicate you've done the following:

• Well Written Title and Summary of the PR
• Label the PR as needed. "release-note/ignore-for-release, release-note/new-feature, release-note/update, release-note/enhancement, release-note/community, release-note/breaking-change, release-note/docs, release-note/infra, release-note/deprecation"
• Accepted the DCO. Commits without the DCO will delay acceptance.
• Made sure tests are passing and test coverage is added if needed.
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed in website repository.

[codecov]

Codecov Report

Merging #19140 (4c9aa69) into main (298ecbb) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main   #19140      +/-   ##
==========================================
- Coverage   67.40%   67.37%   -0.03%     
==========================================
  Files         993      993              
  Lines      108896   108896              
  Branches     2751     2751              
==========================================
- Hits        73400    73373      -27     
- Misses      31556    31579      +23     
- Partials     3940     3944       +4     

Flag	Coverage Δ
unittests	67.37% <ø> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

see 11 files with indirect coverage changes

[chlins]

lgtm