fix: env variables fetching issue for translations

[jajjibhai008]

Description
Used ?= in the makefile to tell make to use the variable if it's already set (from environment or command line), otherwise use the default:

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.54%. Comparing base (19ccb8a) to head (ea2c599).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #766   +/-   ##
=======================================
  Coverage   97.54%   97.54%           
=======================================
  Files         148      148           
  Lines        1302     1302           
  Branches      224      224           
=======================================
  Hits         1270     1270           
  Misses         31       31           
  Partials        1        1           

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