chore: update translations

[github-actions]

translations/en.json changed, so the strings that were missing from
each language have been machine-translated. Existing translations
were not re-sent to the model.

Changes

• de (German): 18 translated
• fr (French): 18 translated
• nl (Dutch): 18 translated
• es (Spanish): 18 translated
• it (Italian): 18 translated
• pl (Polish): 18 translated
• pt (European Portuguese): 18 translated
• pt-BR (Brazilian Portuguese): 18 translated
• cs (Czech): 18 translated

Review notes

• Placeholders such as {name} and {number} are validated
  automatically: any translation that drops, renames, or adds one is
  rejected rather than committed.
• Translations avoid the familiar/polite distinction (German du/Sie,
  French tu/vous, ...) by using impersonal phrasing. Anything that
  slipped through is flagged as a warning in the workflow log.
• Manual corrections are preserved. If you fix a translation by hand,
  this workflow will not overwrite it, even when the English source
  changes later. It reports it under "Needs review" instead.

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This PR was automatically created by the translate workflow