Adding default locale as en. Addresses #3900

[anilreddykatta]

Summary
Currently, we are reading locale information from language prop in Docs. When we don't pass the prop it treats as empty resulting in 404. I defaulted language to en when prop is not passed. Addresses #3900

Test plan

[codecov-io]

Codecov Report

Merging #3907 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3907   +/-   ##
=======================================
  Coverage   58.01%   58.01%           
=======================================
  Files         195      195           
  Lines        6741     6741           
  Branches        6        6           
=======================================
  Hits         3911     3911           
  Misses       2827     2827           
  Partials        3        3

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[cpojer]

Thanks!

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