Allow global off for XPI and tarball creation

--no-xpi and --no-tarball allow you to switch off those options which might be
triggered by the defaukt configs. If a language is set for default XPI or
tarball creation then this options will switch it off.

This is useful to speedup migrations where tarball and XPI creation are not
wanted as it wastes time.
Various: pull from Pootle
Templates: update
Various: update against templates
Templates: update (again)
Various: pull from Pootle
Various: update against templates
Afrikaans: pull from Pootle
[bn_IN] pull from Pootle
en_ZA: update
Templates: update
Templates: update (mobile)
Various: pull from Pootle (mobile)