We do not allow users to choose locale, so there is no practical use for this feature yet.
From Bamboo 2.3 onwards, **internationalisation** is supported for Bamboo plugins, just as it is supported in plugins for Atlassian's JIRA and Confluence. This means that you can allow labels and messages in your plugin to be customised via properties files. You can implement internationalisation support for your plugin by adding the appropriate code and resources to your plugin.