## 10.1 Understanding Message Bundles

Now that you have an idea of locales, to take advantage of them in Grails you have to create message bundles that contain the different languages that you wish to render. Message bundles in Grails are located inside the `grails-app/i18n` directory and are simple Java properties files.

Each bundle starts with the name `messages` by convention and ends with the locale. Grails ships with a bunch of built in message bundles for a whole range of languages within the `grails-app/i18n` directory. For example:

    messages.properties
    messages_de.properties
    messages_es.properties
    etc.

By default Grails will look in `messages.properties` for messages, unless the user has specified a custom locale. You can create your own message bundle by simply creating a new properties file that ends with the locale you are interested. For example `messages_en_GB.properties` for British English.