abp/test/Volo.Abp.Localization.Tests/Volo/Abp/Localization/TestResources/Base/Validation/en.json

{
  "culture": "en",
  "texts": {
    "ThisFieldIsRequired": "This field is required",
    "MaxLenghtErrorMessage": "This field can be maximum of '{0}' chars"
  }
}