Time travel: A date-time selection field at the top of the glossary

[henkvancann]

During the CTWG meeting of Aug 26 an enhancement was proposed to be able to time travel through the commit history of the terms.
What: time-travel
Why: Users want to know the state of the terminology when they last referred to external terms and, more generally, on whichever date they would like to inspect.
Who: User as well as term editors
When: 24/7
How: by using an input feature that allows for the selection of date+time in the past; default is the current date+time

Note it only works on an unbroken string of commits per repo, per branch, and per term directory.