feat: add support i18n

[EndyKaufman]

Description

Example of usage

import { IsNotEmpty, ValidateIf, IsOptional, Equals, Validator, I18N_MESSAGES } from 'class-validator';

class MyClass {
  @IsOptional()
  @Equals('test')
  title: string = 'bad_value';
}
Object.assign(I18N_MESSAGES, {
  '$property must be equal to $constraint1': '$property должно быть равно $constraint1',
});
const model = new MyClass();
validator.validate(model).then(errors => {
  expect(errors.length).toEqual(1);
  expect(errors[0].target).toEqual(model);
  expect(errors[0].property).toEqual('title');
  expect(errors[0].constraints).toEqual({ equals: 'title должно быть равно test' });
  expect(errors[0].value).toEqual('bad_value');
});

Checklist

• the pull request title describes what this PR does (not a vague title like Update index.md)
• the pull request targets the default branch of the repository (develop)
• the code follows the established code style of the repository
  • npm run prettier:check passes
  • npm run lint:check passes
• tests are added for the changes I made (if any source code was modified)
• documentation added or updated
• I have run the project locally and verified that there are no errors

Fixes

fixes #[issue number], fixes #[issue number]

[EndyKaufman]

@NoNameProvided ping)

[EndyKaufman]

Added support integrations with https://crowdin.com/ for manual simplified update translates

Added more examples of usages

Basic set custom messages

import { IsOptional, Equals, Validator, I18N_MESSAGES } from 'class-validator';

class MyClass {
  @IsOptional()
  @Equals('test')
  title: string = 'bad_value';
}

const RU_I18N_MESSAGES = {
  ...I18N_MESSAGES,
  '$property must be equal to $constraint1': '$property должно быть равно $constraint1',
};

const model = new MyClass();

validator.validate(model, messages: RU_I18N_MESSAGES).then(errors => {
  console.log(errors[0].constraints);
  // out: title должно быть равно test
});

Load from file

import { IsOptional, Equals, Validator, I18N_MESSAGES } from 'class-validator';
import { readFileSync } from 'fs';
import { resolve } from 'path';

class MyClass {
  @IsOptional()
  @Equals('test')
  title: string = 'bad_value';
}

const RU_I18N_MESSAGES = JSON.parse(readFileSync(resolve(__dirname, './node_modules/class-validator/i18n/ru.json')).toString());

const model = new MyClass();

validator.validate(model, messages: RU_I18N_MESSAGES).then(errors => {
  console.log(errors[0].constraints);
  // out: title должен быть равен test
});

With override

import { IsOptional, Equals, Validator, I18N_MESSAGES } from 'class-validator';

class MyClass {
  @IsOptional()
  @Equals('test')
  title: string = 'bad_value';
}

Object.assign(I18N_MESSAGES, {
  '$property must be equal to $constraint1': '$property должно быть равно $constraint1',
});

const model = new MyClass();

validator.validate(model).then(errors => {
  console.log(errors[0].constraints);
  // out: title должно быть равно test
});

[EndyKaufman]

Hi, @NoNameProvided I want to use this feature in https://github.com/EndyKaufman/ngx-dynamic-form-builder, please review this PR :(

[EndyKaufman]

I create new clean PR for this changes #743

[github-actions]

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