Add test to ensure non-latin values can be JSON-encoded

[jeromegamez]

Closes #1031

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.53%. Comparing base (bdaaf54) to head (e486a3f).
⚠️ Report is 6 commits behind head on 7.x.

Additional details and impacted files

@@            Coverage Diff            @@
##                7.x    #1032   +/-   ##
=========================================
  Coverage     88.53%   88.53%           
  Complexity     1468     1468           
=========================================
  Files           145      145           
  Lines          4177     4177           
=========================================
  Hits           3698     3698           
  Misses          479      479           

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