[DO-NOT-MERGE] Fixes #5745/BZ963572: upgrade angular-gettext to fix XSS.

**DO NOT MERGE, waiting on angular-gettext 1.0 to no longer be alpha**

The library Bastion uses for i18n, angular-gettext, was
vulnerable to XSS.  This commit upgrades the version of
angular-gettext to one that is no longer vulnerable.

http://projects.theforeman.org/issues/5745
https://bugzilla.redhat.com/show_bug.cgi?id=963572


It's necessary to use `$injector` here in order to prevent a circular dependency between angular-gettext and `$httpProvider`.