The flat "{count} Dokumente / documents / documentos" keys read as
"1 Dokumente" / "1 documents" / "1 documentos" to a screen reader
when only one document falls in the month bucket. Splits each
locale into _singular + _plural keys and picks the form by count
in TimelineBars, mirroring the existing upload_banner_singular /
_plural pattern in this project.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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