Add also language chain

[sportshead]

This would be helpful, as the property doesn't clash with other methods.

[codecov]

Codecov Report

Merging #1324 into master will not change coverage by %.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1324   +/-   ##
=======================================
  Coverage   94.61%   94.61%           
=======================================
  Files          33       33           
  Lines        1708     1708           
  Branches      416      416           
=======================================
  Hits         1616     1616           
  Misses         92       92           

Impacted Files	Coverage Δ
lib/chai/core/assertions.js	99.39% <100.00%> (ø)

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[keithamus]

Thanks for the PR @sportshead! I'm not sure how this will clash with other plugins and the like, so we might have to hold off on merging this just yet before doing more research.

[keithamus]

Agreed. Let's add it!