Localization testing is performed to verify the quality of a product's localization for a particular target culture/locale and is executed only on the localized version of the product.
Modules affected by localization, such as UI and content
Modules specific to Culture/locale-specific, language-specific, and region-specific
Critical Business Scenarios Testing
Installation and upgrading tests run in the localized environment
Plan application and hardware compatibility tests according to the product's target region.
Check for linguistic errors and resource attributes
Verify the systems adherence to the input, and display environment standards
Usability testing of the User interface
Verify cultural appropriateness of UI such as colour, design, etc.