With this endpoint, you can inquire about the status of a glossary upload
job. It answers 200 in every state.

Only the user who started the upload can check it, and only while they
are an administrator of the organization and its plan includes glossary
upload. A job started by someone else returns 404. A job is deleted
with its glossary: once the glossary is deleted, even during the upload,
its jobs return 404 and no callback is sent for them.

• If the value of the status attribute is pending or processing, you
  should check this endpoint again later.
• If the status is failed, errors holds the reason, with the row of
  the file that caused it where there is one. Nothing was saved.
• If the status is succeeded, details holds the totals of the terms
  and translations the upload created, updated and deleted. A term counts
  as updated when its text changed; a change to only its note or case
  flag isn't counted. Translations are counted only in the languages the
  file has a column for, and translations deleted together with their
  term are not counted.