[counters] Fix roman style capitalization (#572)
[counters] Fix roman style capitalization (#572)

ICU uses different convention for roman numeral capitalization than
SILE. This adds a translation which fixes this issue.

Closes #571
simoncozens/sile,alerque/sile,alerque/sile,alerque/sile,alerque/sile,simoncozens/sile,simoncozens/sile,simoncozens/sile