Your file `/app/i18n/test/xx_YY/dictionary.csv` should be have four columns 1. The value of Translate 2. The value should be translated with this. 3. Module used simply `module` 4. Module Name of that particular translator e.g. `Magento_Catalog` **e.g** **`Save Category` `Save Category New ` `module` `Magento_Catalog`** **AND** [InvalidArgumentException] Specified path doesn't exist for this, you have to collect translate variable from Magento2 Root **use** `php bin/magento i18n:collect-phrases -o "/app/i18n/test/xx_YY/dictionary.csv" Magento2ROOT/` **instead of** `php bin/magento i18n:collect-phrases -o "/app/i18n/test/xx_YY/dictionary.csv" /vendor/magento` it will help you.