Perplexities
Maybe it would be better to just have the value expressed in fractions, semihemidemisemihemidemisemiquaver seems untranslatable to me, More like a tongue twister than a term in use. But I'll try asking over there.
https://en.wikipedia.org/wiki/Two_hundred_fifty-sixth_note
Some software also supports extremely short notes. 256th notes are easily accessible in Sibelius as of version 5, but some software supports even shorter notes. The shortest notated duration supported by Finale is a 4096th note, while LilyPond can write notes as short as a 1073741824th (2−30) note with up to 27 beams.
Comments
The Brits what it that way, and those strings (mostly) stem directly from SMuFL, so outside MuseScore control.
Translate it as 256th or the like, just feel free to drop that British name from the translatiion, here's an example of what I do for German:
256th note (demisemihemidemisemiquaver) stem up -> 256stel Note, Hals nach oben
Interesting, didn't know that Finale can go up to 4096th (so far I though them to stop at 128th), and as far as I know Sibelius goes to 512th, so I'm not sure about the correctness of that WikiPedia page.
MuseScore surely won't go higher than 1024th though, as there are no such glyphs in SMuFL.
Which makes me beleive that Dorico won't either (they originally developed SMuFL)
In reply to The Brits what it that way… by Jojo-Schmitz
Yes, thank you, I had already adjusted myself in a similar way (at dawn).
Wikipedia pages can also be corrected (if you are so willing) ;-)