Bump rails-i18n from 5.1.2 to 5.1.3

Bumps [rails-i18n](https://github.com/svenfuchs/rails-i18n) from 5.1.2 to 5.1.3.
- [Release notes](https://github.com/svenfuchs/rails-i18n/releases)
- [Changelog](https://github.com/svenfuchs/rails-i18n/blob/master/CHANGELOG.md)
- [Commits](https://github.com/svenfuchs/rails-i18n/commits)

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

Gemfile.lock

@@ -394,7 +394,7 @@ GEM
       nokogiri (>= 1.6)
     rails-html-sanitizer (1.0.4)
       loofah (~> 2.2, >= 2.2.2)
-    rails-i18n (5.1.2)
+    rails-i18n (5.1.3)
       i18n (>= 0.7, < 2)
       railties (>= 5.0, < 6)
     rails_12factor (0.0.3)