[Unison-hackers] branch cleanup

[Greg Troxel]

I noticed some branches in the repo.  I wonder if these should be
brought up to date and turned into PRs, or if they are no longer needed
because something else happened, or if they are simply so old they
should just be deleted.

* https://github.com/bcpierce00/unison/tree/i18n

$ git log --oneline origin/master..origin/i18n
e893803 (upstream/i18n, origin/i18n) Add ugettext and compile with it. Allow to disable/enable gettext through ENABLE_NLS variable.
daa9608 Add the po/ directory, which stores i18n information.
f643dcd Create new i18n branch for work on internationalization

* https://github.com/bcpierce00/unison/tree/MakefileNit

$ git  log --oneline upstream/master..upstream/MakefileNit
4efa55c (upstream/MakefileNit, origin/MakefileNit) Makefile nit
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