fix: refine error message of the plugin already exists

[ruibaby]

What type of PR is this?

/area core
/kind bug
/milestone 2.13.x

What this PR does / why we need it:

补全插件已存在错误提示的翻译。

Does this PR introduce a user-facing change?

None

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5fdf6c0) 56.91% compared to head (94a79a1) 56.90%.
Report is 14 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5376      +/-   ##
============================================
- Coverage     56.91%   56.90%   -0.01%     
+ Complexity     3319     3315       -4     
============================================
  Files           587      587              
  Lines         18968    18953      -15     
  Branches       1401     1399       -2     
============================================
- Hits          10795    10785      -10     
+ Misses         7594     7588       -6     
- Partials        579      580       +1     

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[JohnNiang]

/lgtm

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JohnNiang

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