xend: drop XenAPI error message translation

xend: drop XenAPI error message translation

The only "translation" is to the C locale (e.g. the NUL
translation). I think it very unlikely we are going to see any new
translations of the XenAPI error messages at this point so the only
purpose of this code appears to be to periodically regenerate
xen-xm.pot with a new embedded timestamp, to the detriment of those of
us who use a version control system.

After much beating with sticks I mananged to enable XenAPI support in
xend and configure xm such that it returns "Permission denied." (AKA
the SESSION_AUTHENTICATION_FAILED message) which I take to be a sign
I've not broken things too badly.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>