fix(): country-coded language breaks plurals with po-gettext

[semoal]

Will close #1130

[vercel]

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[github-actions]

size-limit report 📦

Path	Size
./packages/core/build/cjs/core.production.min.js	2.79 KB (0%)
./packages/detect-locale/build/cjs/detect-locale.production.min.js	798 B (0%)
./packages/react/build/cjs/react.production.min.js	4.85 KB (0%)
./packages/remote-loader/build/cjs/remote-loader.production.min.js	92.03 KB (0%)

[codecov]

Codecov Report

Merging #1131 (84a26a0) into main (ea00f55) will decrease coverage by 0.19%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1131      +/-   ##
==========================================
- Coverage   82.28%   82.09%   -0.20%     
==========================================
  Files          56       56              
  Lines        1677     1687      +10     
  Branches      458      462       +4     
==========================================
+ Hits         1380     1385       +5     
- Misses        173      177       +4     
- Partials      124      125       +1     

Impacted Files	Coverage Δ
packages/cli/src/api/formats/po-gettext.ts	83.73% <100.00%> (+0.13%)	⬆️
packages/cli/src/api/extractors/index.ts	55.55% <0.00%> (-13.68%)	⬇️
packages/conf/src/index.ts	79.74% <0.00%> (-1.03%)	⬇️
packages/macro/src/macroJs.ts	90.97% <0.00%> (ø)
packages/macro/src/macroJsx.ts	90.97% <0.00%> (ø)
packages/cli/src/api/catalog.ts	81.48% <0.00%> (ø)
packages/cli/src/api/compile.ts	96.15% <0.00%> (+0.15%)	⬆️
packages/core/src/context.ts	81.13% <0.00%> (+0.36%)	⬆️

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