fix: add english value for actionItemCompleted

[NamitBhutani]

What kind of change does this PR introduce?
Bugfix

Issue Number:

Fixes #1929

Did you add tests for your changes?

Already present
Summary

Field for translation was missing in en.json. Added that.

Does this PR introduce a breaking change?

NO

Other information

Have you read the contributing guide?

Yes

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.32%. Comparing base (d923b65) to head (abecfb4).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1932   +/-   ##
========================================
  Coverage    98.32%   98.32%           
========================================
  Files          207      207           
  Lines         5536     5536           
  Branches      1633     1633           
========================================
  Hits          5443     5443           
  Misses          87       87           
  Partials         6        6           

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[Cioppolo14]

@NamitBhutani Please fix the failing test.

[NamitBhutani]

@NamitBhutani Please fix the failing test.

The error in the failing test is present on develop branch too, it's not a part this commit.