[#4158] Add missing English translation for invalid_time

[Viicos]

Also remove unused Dutch translations

Closes #4158

Changes

invalid_time is not defined by Formio, so the missing English translation would result in the bare key being displayed

Checklist

Check off the items that are completed or not relevant.

• Impact on features

  • Checked copying a form
  • Checked import/export of a form
  • Config checks in the configuration overview admin page
  • Problem detection in the admin email digest is handled

• Release management

  • I have labelled the PR as "needs-backport" accordingly

• I have updated the translations assets (you do NOT need to provide translations)

  • Ran ./bin/makemessages.sh
  • Ran ./bin/compilemessages_js.sh

• Commit hygiene

  • Commit messages refer to the relevant Github issue
  • Commit messages explain the "why" of change, not the how

[Viicos]

Running ./bin/compilemessages_js.sh removes some unrelated translations, should I include this in this PR?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.12%. Comparing base (1df0654) to head (f888ea9).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4275   +/-   ##
=======================================
  Coverage   96.12%   96.12%           
=======================================
  Files         729      729           
  Lines       23491    23491           
  Branches     2757     2757           
=======================================
  Hits        22580    22580           
  Misses        645      645           
  Partials      266      266           

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