Fix French plural rules for million counts

[martynchamberlin]

Summary

• Fix French standard plural selection to support CLDR one/many/other categories in classic transChoice pipe-separated messages.
• Select the many form for nonzero exact multiples of 1,000,000, keep 0/1 on the one form, and use the other form for all remaining counts.
• Add a focused regression test covering 0, 1, 2, 999999, 1000000, 1000001, and 2000000.
• Rebuild the minified translator bundle.

Fixes #334.

Tests

• npm test
• npm run build
• git diff --check