Land #16110, bump i18n to 1.9.1

Author: bcoles

Gemfile.lock

@@ -225,7 +225,7 @@ GEM
       domain_name (~> 0.5)
     http_parser.rb (0.8.0)
     httpclient (2.8.3)
-    i18n (1.9.0)
+    i18n (1.9.1)
       concurrent-ruby (~> 1.0)
     io-console (0.5.11)
     irb (1.3.6)