rhbz1110627 zanata init

https://bugzilla.redhat.com/show_bug.cgi?id=1110627
and https://bugzilla.redhat.com/show_bug.cgi?id=1038852

Depends on https://github.com/zanata/zanata-api/pull/15 and https://github.com/zanata/zanata-server/pull/520
This may be a bit hard for users to understand. It means we could not find the download for the new file, right?

The advice "Maybe try again next time" is too vague - we can be more definite so the user feels more comfortable about what to do. We could say "Please try to update later" or something like that.