CRM-21055 Revert change of "cancel" to "close" on backend contribution form

[agh1]

This reverts commit 35c930c.

The change was done in isolation, leading to inconsistency with other forms
that have the Save / Save and New / Cancel pattern.

@totten @colemanw please take a look before shipping 4.7.25--I just noticed #10845 as I was writing up the release notes and I'm very concerned about it. See the explanation on JIRA

Basically, either all instances of this pattern should say "Close" or all should say "Cancel". In the meantime, we shouldn't be shipping it with the one exception, especially since it changes longstanding behavior.

@eileenmcnaughton @pradpnayak @monishdeb @lcdservices

[JoeMurray]

I don't think this should be hastily reverted. See issue for discussion.

[eileenmcnaughton]

Per comments on Chat I AM going for a hasty revert. I don't think this was done hastily as it has been in the rc for a month and in master for a while before that, or without discussion. However, I think it only provides a trivial benefit and trivially affects lots of people so caution is the better part of valour here

[eileenmcnaughton]

hmm looks like we missed the release!

[totten]

There seems to be general support for reverting the label change. Joe's point is good that it wouldn't justify reissuing a release on its own -- but we're doing a reissue anyway due to the release-notes.

[eileenmcnaughton]

Note that this might yet get re-introduced - but I think we need to discuss further first since Andrew had some good points (to be reconciled with good points made by others in favour of this change)