Use locales for acceptance macro message

config/errors.yml

@@ -0,0 +1,4 @@
+en:
+  dry_validation:
+    errors:
+      acceptance: "must accept %{key}"

lib/dry/validation/contract.rb

@@ -55,6 +55,7 @@ module Dry
       extend ClassInterface
 
       config.messages.top_namespace = 'dry_validation'
+      config.messages.load_paths << Pathname(__FILE__).join('../../../../config/errors.yml').realpath
 
       # @!attribute [r] config
       #   @return [Config]

lib/dry/validation/macros.rb

@@ -9,8 +9,10 @@ module Dry
         module RuleMethods
           # @api public
           def acceptance
+            key_name = keys[0]
+
             @block = proc do
-              key.failure('must accept terms') unless values[keys[0]].equal?(true)
+              key.failure(:acceptance, key: key_name) unless values[key_name].equal?(true)
             end
           end
         end