FIX validation massages (#35)

Author: enricodelazzari

src/Rules/ExistsEncrypted.php

@@ -40,6 +40,6 @@ public function passes($attribute, $value): bool
 
     public function message(): string
     {
-        return 'The selected :attribute is invalid.';
+        return __('validation.exists');
     }
 }

src/Rules/UniqueEncrypted.php

@@ -40,6 +40,6 @@ public function passes($attribute, $value): bool
 
     public function message(): string
     {
-        return 'The :attribute has already been taken.';
+        return __('validation.unique');
     }
 }