- The catalog-completeness test requires a non-empty Czech label for
every key of the reference (Japanese) table.
- Czech context keys: `Page Layout|Orientation` and `Orientation` get
different labels; unknown text such as `Sheet1!A1` passes through.
- `cs-CZ` / `cs_CZ.UTF-8` system tags and `parse("cs")` resolve to Czech.
- The ribbon renders after switching to Czech, and the choice persists
in UiState.
- Czech keeps canonical formula entry (`=SUM(1.5,2.25)`), and `=SUMA(1;2)`
is not accepted.
- The UI font draws every Czech accented letter, upper and lower case,
without tofu; Czech shares the default Han font order.
Czech spells "Data" as English does, so the Czech checks probe
"Formulas" -> "Vzorce", where an English fallback would be caught.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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