generate local file on install rather than load

lib/generators/validates_timeliness/install_generator.rb

@@ -9,6 +9,9 @@ module ValidatesTimeliness
         copy_file 'validates_timeliness.rb', 'config/initializers/validates_timeliness.rb'
       end
 
+      def copy_locale_file
+        copy_file 'en.yml', 'config/locales/validates_timeliness.en.yml'
+      end
     end
   end
 end

lib/generators/validates_timeliness/templates/en.yml

@@ -0,0 +1,16 @@
+en:
+  errors:
+    messages:
+      invalid_date: "is not a valid date"
+      invalid_time: "is not a valid time"
+      invalid_datetime: "is not a valid datetime"
+      is_at: "must be at %{restriction}"
+      before: "must be before %{restriction}"
+      on_or_before: "must be on or before %{restriction}"
+      after: "must be after %{restriction}"
+      on_or_after: "must be on or after %{restriction}"
+  validates_timeliness:
+    error_value_formats:
+      date: '%Y-%m-%d'
+      time: '%H:%M:%S'
+      datetime: '%Y-%m-%d %H:%M:%S'