[stable6.0] chore(i18n): Fix grammar

[backportbot]

Backport of PR #7337

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 13.67%. Comparing base (a282899) to head (1c843d5).
⚠️ Report is 3 commits behind head on stable6.0.

Files with missing lines	Patch %	Lines
src/views/Proposal/ProposalPublic.vue	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           stable6.0    #7338   +/-   ##
==========================================
  Coverage      13.67%   13.67%           
==========================================
  Files            218      218           
  Lines          11182    11182           
  Branches        2703     2689   -14     
==========================================
  Hits            1529     1529           
  Misses          9303     9303           
  Partials         350      350           

Flag	Coverage Δ
javascript	13.67% <0.00%> (ø)

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