[PPP-3343] - Japanese characters in prompt of PIR get encoded in dropdown menu

@dkincade, @mdamour1976 please review

for branch 5.1 https://github.com/pentaho/pentaho-platform-plugin-reporting/pull/119
for branch 5.1.2.1 https://github.com/pentaho/pentaho-platform-plugin-reporting/pull/122
for branch 5.2 https://github.com/pentaho/pentaho-platform-plugin-reporting/pull/120
for branch 5.2.0.2 https://github.com/pentaho/pentaho-platform-plugin-reporting/pull/123