locale: list unsupported environment settings in warning

Now if you log in with unsupported locale, you'll see:
 The unknown environment variables are:
   LC_CTYPE=en_GB.utf-8 LC_MESSAGES=en_GB.utf-8 LC_ALL=en_GB.utf-8

LP: #1558069

1 files changed, 1 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index e06bf60f..805df93b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -98,6 +98,7 @@
    device naming via systemd.link.
  - FreeBSD: add support for installing packages, setting password and
    timezone.  Change default user to 'freebsd'. [Ben Arblaster]
+ - locale: list unsupported environment settings in warning (LP: #1558069)
 
 0.7.6:
  - open 0.7.6