The I18n properties files asset is one of the types of content that can comprise a BRJS application. There is more information about assets on About Bundlers.
Each i18n file is a standard Java properties file, and contains label values appropriate for a particular locale.
The file en_GB.properties might contain the following definition for a greeting:
Whilst the file fr_FR.properties would contain:
The browser will request all labels for a particular locale. In most circumstances, the i18n bundler only loads the properties files appropriate for the requested locale. When a deployable application is being generated however, a separate i18n bundle will be generated for every locale for which properties files exist. The localised labels are sent to the browser as a single JSON map of key/label pairs.
The i18n bundler enforces a namespacing convention, which ensures that someone working in a blade cannot accidentally overwrite a label in another blade. An error is reported if a template violates the namespacing convention. The bundler verifies that the label identifier key follows the namespacing convention.
In this example, the properties file must reside in a blade for which the app name is novotrader; the bladeset name is fx, and the blade is called tile.