fix(module:i18n): update fr translations

[sebcam]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Application (the showcase website) / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

global.placeholder translation is missing, causing a warning in the cascader component.

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

Add global.placeholder translation for fr-XX.ts
Fixing warning in cascader when call to getLocalData('global')

[zorro-bot]

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[codecov]

Codecov Report

Merging #7364 (212eff1) into master (b517bd4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #7364   +/-   ##
=======================================
  Coverage   91.62%   91.62%           
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  Files         487      487           
  Lines       16013    16013           
  Branches     2604     2604           
=======================================
  Hits        14672    14672           
  Misses       1027     1027           
  Partials      314      314           

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