p header argument to give the correct plural form

[cirosantilli]

Sometimes the pluralize js lib gets it wrong. There is an API to fix a word, and we should PR them instead, but for lazy one offs... let's do it?

= Mitochondrion
{p=Mitochondria}

\x[mitochondrion]{p}

or perhaps with a separate header:

= Mitochondrion

= Mitochondria
{synonym=plural}

?

A workaround for this especially when {p} does not cut it because the plural is not the last word is to use {synonym}:

= Shade of grey

= Shades of grey
{synonym}

maybe that is good enough actually.

The advantage of {p} is that is does not take up extra ID space. The diametrically opposite proposal is done at: #165

[cirosantilli]

E.g. pluralize bugs: plurals/pluralize#172