Add or change a glossary term's translation in one language, its
translation note, or whether it is reviewed. Attributes left out keep
their values. A translation note can be set on a term without a
translation.

The language must be one of the glossary's languages. Every request
needs the right to submit translations for the language and a plan that
supports glossary editing. Changing reviewed, or the text of a
reviewed translation, also needs the right to review the language. Both
rights follow the glossary's permissions.

A translation change doesn't move the term's datetime_modified.

A 409 means the term is locked in the language, so its translation
can't change, reviewed: true is sent for a term with no translation in
the language, or the body's id names another term translation than the
path, as JSON:API requires. While a locked term's translation is
reviewed, as locking leaves it, a translation change from someone who
can't review the language is a 403 instead.