Localization is at the core of CQ5. It provides support for adapting applications, created using the CQ5 platform, into different languages and regional configurations . While processing the request, the Locale is extracted. This is then used to reference a language code, and optionally a country code, which can be used for controlling either the specific content or format of certain output.

Localization will be used throughout CQ5 - wherever reasonable. One notable exception is the system log information of CQ5 itself, this is never localized and always in English.