### Please describe the problem.

All git annex commands run successfully but are prefixed by an annoying error message:

"/bin/sh: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)"


### What steps will reproduce the problem?

`git annex init` or just about any git annex command.


### What version of git-annex are you using? On what operating system?

git-annex version: 5.20150710-g8fd7052 on arch linux 4.0.7-2.

### Please provide any additional information below.

# locale -a 
C
en_US
en_US.iso88591
en_US.utf8
hebrew
he_IL
he_IL.iso88598
he_IL.utf8
POSIX
