support artificial languages

[nicksnyder]

fixes #146

[codecov]

Codecov Report

Merging #171 into master will decrease coverage by 0.07%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #171      +/-   ##
==========================================
- Coverage   71.76%   71.69%   -0.08%     
==========================================
  Files          28       28              
  Lines        2391     2392       +1     
==========================================
- Hits         1716     1715       -1     
- Misses        580      581       +1     
- Partials       95       96       +1

Impacted Files	Coverage Δ
v2/i18n/bundle.go	59.61% <100%> (+0.79%)	⬆️
v2/i18n/localizer.go	76.19% <0%> (-2.39%)	⬇️

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