How to internationalize Yii applications?

@gilbert 

To internationalize Yii applications, you can follow these steps:

1. Enable message translations: Open the config file main.php and add the following lines to the 'components' array:

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'i18n' => [
    'translations' => [
        'app*' => [
            'class' => 'yiii18nPhpMessageSource',
            'basePath' => '@app/messages',
            'sourceLanguage' => 'en-US',
            'fileMap' => [
                'app' => 'app.php',
                'app/error' => 'error.php',
            ],
        ],
    ],
],

1. Create translation files: Create a directory named 'messages' under your main application directory, and then create subdirectories for each language you want to support (e.g. 'en-US', 'fr-FR', 'de-DE', etc.). In each language directory, create a file named 'app.php' (or whatever you specified in the 'fileMap' section above) and add the translation messages in key-value pairs.
2. Use translation messages in your views or controllers: In your views or controllers, use the Yii::t() method to translate the messages. For example:

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echo Yii::t('app', 'Hello World!');

This will output the translated message for the current language.

1. Set the application language: You can set the application language in the main.php config file using the 'language' parameter:

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'language' => 'en-US',

You can also change the language dynamically by setting the 'language' parameter of the Yii::$app object:

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Yii::$app->language = 'fr-FR';

That's it! Your Yii application is now internationalized and ready to support multiple languages.