Run Localized
Choose Project > Run Localized Application to try the translation in the running application. Select the languages; Localizer creates the localized files for them and starts the application in the current target language.
Set the command, its arguments, and the working directory on the Project > Run Localized page of the project properties. See Run Parameters.
Some applications choose the language themselves, for example by the Windows display language or a setting of the application. Make the application use the target language, for example with a command-line argument or a setting. A non-Unicode application may need the system locale of the target language. See Running a non-Unicode application.
See also Create Localized Files and Crash Finder.