Complete custom language mapping

[kelson42]

Fixes #1076

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 40.93%. Comparing base (0160722) to head (72147ae).
Report is 46 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1080   +/-   ##
=======================================
  Coverage   40.93%   40.93%           
=======================================
  Files          58       58           
  Lines        4204     4204           
  Branches     2307     2307           
=======================================
  Hits         1721     1721           
  Misses       1015     1015           
  Partials     1468     1468           

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