I wonder if this isn't a "Site requests" issue.

A number of commits were lost during the migration, and this appears to be causing l10nupdate to fail:

fatal: reference is not a tree: ee58aec150b46bf5137bfcaeb5d4920b1a5d0400
.gitignore: needs merge
.gitreview: needs merge
error: you need to resolve your current index first
.gitignore: needs merge
.gitreview: needs merge
error: you need to resolve your current index first
.gitignore: needs merge
error: you need to resolve your current index first
Unable to checkout 'ee58aec150b46bf5137bfcaeb5d4920b1a5d0400' in submodule path 'CentralLogging'
Unable to checkout '2b43badc9607f8775f08efee820f7c5a15665f32' in submodule path 'DataTypes'
Unable to checkout '93e0c5a74be897a2accc3a16621aabd5d8239431' in submodule path 'WikibaseDatabase'
Unable to checkout '741079183e328588e8f899a4432e5ee362dfc395' in submodule path 'WikibaseQuery'

The 'reference is not a tree' message is in reference to https://gerrit.wikimedia.org/r/#/c/82795/

When attempting to fetch the change, Git complains:
fatal: Couldn't find remote ref refs/changes/95/82795/1
Unexpected end of command stream

• This bug has been marked as a duplicate of bug 53841 ***

I cleaned up a the repos on tin and 1.22wmf16 has been updated so far, 1.22wmf15 is underway

git clone updated.
Running updates for 1.22wmf16 (on aawikibooks)
529740 MediaWiki messages are updated
Updated 1165926 messages in total
Done
All done in 377.40279197693 seconds