set root mailbox name neutral string

So it's "ok" for all languages
Merge branch 'master' into jgarcia/workaround-to-have-neutral-inbox-name

Conflicts:
	mapiproxy/servers/default/emsmdb/emsmdbp_provisioning.c
Merge pull request #31 from Zentyal/jgarcia/workaround-to-have-neutral-inbox-name

set root mailbox name to neutral string