It's not quite that simple - you would need to maintain a list of proper >
nouns and not convert those to lower-case.
True - but you could build a list of those that the converter skips.
However, my argument is that any British English language file should >
use sentence case, as that's what is in common use in that language.
Not necessarily true, for example poetry / lyric titles frequently use title
case. For menu settings I'd argue they're titles, and not sentences, eg:
MP visits India on trade visit (sentence headline).
vs.
MP at Home (title headline).
Title case in British English is more formal, more grand - it's a matter of
taste, nor correctness.
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gl