A method and system for validating translated files for inclusion in an application being developed. Translatable files having externalized content in a single base language are sent for translation into other languages. Translated files resulting from a translation of the translatable files are received. Each translated file is statically and dynamically validated to detect error(s). The static validation is based on comparing the translatable files to the translated files. The dynamic validation is based on a simulation of how a user interface of the application presents the externalized content, without including an actual presentation of the externalized content by the user interface. Modified translated files that correct the detected error(s) are received and provided for a presentation of the externalized content by the user interface.