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You can test the translation files you create and upload into by clicking the test icon on the Internationalization screen or you can use the &locale URL parameter to initialize the form with other languages. See Multi Language Support for details on creating translations and testing locale translations ..
Purging form/flow test data
Refer to this article for a quick easy way to purge your test data (tasks and submissions).
Internet Explorer Compatibility Mode
If your Forms and flows do not look or work correctly in Internet Explorer, Compatibility View may be turned on. Refer to this article for more information.