Add donut, and other words missing from aspell

[DimitriPapadopoulos]

doughnut->donut
doughnuts->donuts

Unfortunately, donut is missing from the aspell dictionary.
Until it is added to aspell or we modify our CI tests, we cannot add it.

See #2574 and GNUAspell/aspell#628.

[skangas]

I'm adding in these too, that also seem to be missing from the aspell dictionary:

aesthetic->esthetic
aesthetically->esthetically
aesthetician->esthetician
aesthetics->esthetics
biassed->biased
colourations->colorations
customisable->customizable
dialogues->dialogs
focussed->focused
focusses->focuses
focussing->focusing
greyscale->grayscale
haemorrhagic->hemorrhagic
high-colour->high-color
lambast->lambaste
lambasts->lambastes
licenced->licensed
licencing->licensing
low-colour->low-color
ochreous->ocherous
ochrey->ochery
refocussed->refocused
refocusses->refocuses
refocussing->refocusing
synchroniser->synchronizer

[DimitriPapadopoulos]

May be fixed by #1485.

[DimitriPapadopoulos]

See also #1480, #1562, #103, ...