Auto-pluralize glossary terms (via flag, maybe)

Is your feature request related to a problem? Please describe.

When referring to glossary items, you have to follow the exact form, and have to specify singular and plural form separately:

.. glossary::

   foo
      Text.

This works: One :term:`foo`.

This does not work: Many :term:`foos`.

Workaround #1: Many :term:`foos <foo>`. But it's annoyingly verbose.

Workaround #2: Many :term:`foo`\s. But it's kinda ugly and rendered output is ugly too.

.. glossary::

   workaround
   workarounds
      Text.

Workaround #3: Many :term:`workarounds`. But then glossary looks awful.

.. |foos| replace:: :term:`foos <foo>`

Workaround #4: Many |foos|. But the syntax is completely different, you lose static validation (depends on editor) and so on.

Describe the solution you'd like

How about simply auto-building the plural form for glossary targets? Adding s would work for English (for most cases) but probably not for other languages, so it should be configurable.

Describe alternatives you've considered

No idea.

The issue names no implementation files, tests, or entry points. Start by clarifying the configurable pluralization behavior and non-English expectations with maintainers; done means glossary references support the agreed behavior and it is covered by documentation and tests.