handle zh correctly

[nicksnyder]

fixes #107

[codecov]

Codecov Report

Merging #109 into master will increase coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #109      +/-   ##
==========================================
+ Coverage   67.66%   67.71%   +0.05%     
==========================================
  Files          28       28              
  Lines        2276     2280       +4     
==========================================
+ Hits         1540     1544       +4     
  Misses        657      657              
  Partials       79       79

Impacted Files	Coverage Δ
v2/internal/plural/rules.go	100% <100%> (ø)	⬆️

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