{
    "name": "atk4/core",
    "type": "library",
    "description": "Agile Core - collection of PHP Traits for designing object-oriented frameworks",
    "keywords": ["php", "framework", "trains", "agile toolkit"],
    "homepage": "https://github.com/atk4/core",
    "license": "MIT",
    "authors": [
        {
            "name": "Romans Malinovskis",
            "email": "romans@agiletoolkit.org",
            "homepage": "https://nearly.guru/"
        }
    ],
    "require": {
        "php": ">=7.2.0",
        "psr/log": "~1.0",
        "ext-json": "*",
        "symfony/translation": "^4.3"
    },
    "require-dev": {
        "phpunit/phpunit": "*",
        "symfony/yaml": "~2.1|~3.0|~4.0",
        "satooshi/php-coveralls": "^1.0",
        "codeclimate/php-test-reporter": "*"
    },
    "suggest": {
        "symfony/yaml": "~2.1|~3.0|~4.0"
    },
    "autoload": {
        "psr-4": {"atk4\\core\\":"src/"}
    },
    "autoload-dev": {
        "psr-4": {"atk4\\core\\tests\\":"tests/"}
    }
}

{
    "name": "atk4/core",
    "type": "library",
    "description": "Agile Core - collection of PHP Traits for designing object-oriented frameworks",
    "keywords": ["php", "framework", "trains", "agile toolkit"],
    "homepage": "https://github.com/atk4/core",
    "license": "MIT",
    "authors": [
        {
            "name": "Romans Malinovskis",
            "email": "romans@agiletoolkit.org",
            "homepage": "https://nearly.guru/"
        }
    ],
    "require": {
        "php": ">=7.2.0",
        "psr/log": "~1.0",
        "ext-json": "*",
        "symfony/contracts": "^1.1"
    },
    "require-dev": {
        "phpunit/phpunit": "*",
        "symfony/yaml": "~2.1|~3.0|~4.0",
        "satooshi/php-coveralls": "^1.0",
        "codeclimate/php-test-reporter": "*"
    },
    "suggest": {
        "symfony/yaml": "~2.1|~3.0|~4.0"
    },
    "autoload": {
        "psr-4": {"atk4\\core\\":"src/"}
    },
    "autoload-dev": {
        "psr-4": {"atk4\\core\\tests\\":"tests/"}
    }
}

Change require - symfony/translation => symfony/contracts
Change require - symfony/translation => symfony/contracts

the whole package symfony/translation is needed only for translations