Merge pull request #616 from codealchemy/normalize-keys/splat

Minor `I18n.normalize_keys` improvement

Author: radar

Diff for: lib/i18n.rb

@@ -338,11 +338,11 @@ def with_locale(tmp_locale = nil)
     def normalize_keys(locale, key, scope, separator = nil)
       separator ||= I18n.default_separator
 
-      keys = []
-      keys.concat normalize_key(locale, separator)
-      keys.concat normalize_key(scope, separator)
-      keys.concat normalize_key(key, separator)
-      keys
+      [
+        *normalize_key(locale, separator),
+        *normalize_key(scope, separator),
+        *normalize_key(key, separator)
+      ]
     end
 
     # Returns true when the passed locale, which can be either a String or a