Allow Script Runner to render UTF-8 chars

[jmthomas]

closes #1660

[codecov]

Codecov Report

Merging #1661 (a96e71a) into master (84d6dce) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1661   +/-   ##
=======================================
  Coverage   77.85%   77.85%           
=======================================
  Files         234      234           
  Lines       18166    18166           
=======================================
  Hits        14144    14144           
  Misses       4022     4022           

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