fix: Revert ember-l10n to 3.2.1

[iamareebjamal]

Fixes #3968
Reverts #3899

[codecov]

Codecov Report

Merging #3971 into development will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #3971   +/-   ##
============================================
  Coverage        21.99%   21.99%           
============================================
  Files              460      460           
  Lines             4728     4728           
============================================
  Hits              1040     1040           
  Misses            3688     3688

Impacted Files	Coverage Δ
app/services/l10n.js	53.84% <ø> (ø)	⬆️

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