Bump i18n-js from 3.7.1 to 3.8.0

Bumps [i18n-js](https://github.com/fnando/i18n-js) from 3.7.1 to 3.8.0.
- [Release notes](https://github.com/fnando/i18n-js/releases)
- [Changelog](https://github.com/fnando/i18n-js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/fnando/i18n-js/compare/v3.7.1...v3.8.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Gemfile

@@ -3,7 +3,7 @@ ruby "2.3.7"
 git_source(:github) { |repo_name| "https://github.com/#{repo_name}.git" }
 
 gem 'i18n', '~> 0.6.11'
-gem 'i18n-js', '~> 3.7.1'
+gem 'i18n-js', '~> 3.8.0'
 gem 'rails', '~> 4.0.13'
 gem 'rails-i18n', '~> 4.0'
 gem 'rails_safe_tasks', '~> 1.0'

Gemfile.lock

@@ -421,7 +421,7 @@ GEM
       mime-types (~> 3.0)
       multi_xml (>= 0.5.2)
     i18n (0.6.11)
-    i18n-js (3.7.1)
+    i18n-js (3.8.0)
       i18n (>= 0.6.6)
     immigrant (0.3.6)
       activerecord (>= 3.0)
@@ -754,7 +754,7 @@ DEPENDENCIES
   highline (= 1.6.18)
   httparty (~> 0.18)
   i18n (~> 0.6.11)
-  i18n-js (~> 3.7.1)
+  i18n-js (~> 3.8.0)
   immigrant
   jquery-migrate-rails
   jquery-rails (= 3.1.5)