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Project > Branding... > Resource Bundles (Tab) > Modify a resource then go to branding/modules/.../, add a locale on the modified Bundle.properties start the application in that particular locale the modification is not taken into account.
The branding dir is only for branding, not for localization. The standard suite build script does not offer any predefined locations for localization files, but it is possible to set up localization by adding a target in build.xml using <branding> on a different dir.