Update errors.ts

[mattkohl]

Fixed grammatical mistake in error msg

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[maciaszczykm]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: maciaszczykm, mattkohl

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[codecov]

Codecov Report

Merging #4109 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4109   +/-   ##
=======================================
  Coverage   46.39%   46.39%           
=======================================
  Files         194      194           
  Lines        8922     8922           
  Branches       83       83           
=======================================
  Hits         4139     4139           
  Misses       4528     4528           
  Partials      255      255

Impacted Files	Coverage Δ
src/app/frontend/common/errors/errors.ts	45.09% <ø> (ø)	⬆️

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