(SERVER-1912) Update gettext-setup gem to latest version (0.26)
(SERVER-1912) Update gettext-setup gem to latest version (0.26)

This version of the gem has the `translation_repository` method whose
absence is causing errors when loading modules.

puppetlabs/puppetserver,puppetlabs/puppetserver,puppetlabs/puppetserver,puppetlabs/puppet-server,puppetlabs/puppet-server,puppetlabs/puppet-server,puppetlabs/puppetserver