Fills lang/phrase/qet_fr_xx.qph for every language QET ships, following
on from discussion #873. A phrase book is never compiled into what
ships -- a translator opens it in Qt Linguist and sees a suggestion
already filled in, to accept or correct.
Only ever appends. phrasebook.write() skips any source string already
in the file (case-insensitive), so no existing entry -- human or
machine -- is touched. 24 languages had no phrase book at all before
this; the other 5 (da, de, nl, ru, sv) keep every line they had.
Built and run with tools/qet-i18n in the qelectrotech-docker harness
(DeepSeek Flash). Companion to qelectrotech-elements#82, which does the
same for the element collection.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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