(Review needed) Keyboard: keydown and keyup

A falta de reviewers hice merge
confío en que es g"ood enough" y es mejor que esté online.

-tal vez haga un break, no es seguro-
necesitaría maintainers que ayuden con la sincronización,
tarea más pesada que la traduccion

pero bué...

Review the already-merged keyboard keydown and keyup translation described in the issue, then check the repository's synchronization process with maintainers. Done means the translation is reviewed and its synchronization status is agreed; no file or test is named in the issue.

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