Czech is in COMPLETE_MESSAGES, so a new status or error message needs a
cs.tsv row too. czech_reads_as_czech checks the vocabulary (Nástroj
Pracovní plocha, Vzorník, Operace s cestami, Tah, Výplň), the three
plural forms of a layer count, the axis context and a nested message;
czech_plurals_have_three_forms now also runs every @plural row through
trn for one, few and other counts.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>