Update ruby193-rubygem-fast_gettext to 0.8.0-12.el6

- add fast_gettext for hammer (jmontleo@redhat.com)
- fix typo in rpm spec file (jmontleo@redhat.com)
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- update build dependencies (jmontleo@redhat.com)
- update build dependencies (jmontleo@redhat.com)
New package rubygem-fast_gettext, version 0.8.0-12.el6