Add ruby_parser gem for all environments.

It was only available for test and development environments and we need
it to run the `rake gettext:pack` command in omnibus which doesn't have
the test/dev gems installed.

Gemfile

@@ -257,6 +257,7 @@ gem 'sentry-raven', '~> 2.4.0'
 gem 'premailer-rails', '~> 1.9.0'
 
 # I18n
+gem 'ruby_parser', '~> 3.8.4', require: false
 gem 'gettext_i18n_rails', '~> 1.8.0'
 gem 'gettext_i18n_rails_js', '~> 1.2.0'
 gem 'gettext', '~> 3.2.2', require: false, group: :development

Gemfile.lock

@@ -1012,6 +1012,7 @@ DEPENDENCIES
   rubocop-rspec (~> 1.15.0)
   ruby-fogbugz (~> 0.2.1)
   ruby-prof (~> 0.16.2)
+  ruby_parser (~> 3.8.4)
   rufus-scheduler (~> 3.1.10)
   rugged (~> 0.25.1.1)
   sanitize (~> 2.0)