FireBook now speaks ten languages. The whole app - duty names, the fire door check guidance, the year ledger and every screen - is translated into Spanish, French, German, Portuguese, Hindi, Arabic, Japanese, Korean and Simplified Chinese, with right-to-left layout in Arabic.
Dates now follow your phone's language too.
British Standard references (BS 5839-1 and the rest) stay in English on purpose - they name specific UK documents.