Hi John,
I recommend to always retain the original input in your database. You then have access to the response as written, and can translate it as needed.
I assume that your feedback goes into a database. You can define an additional column in your dataset, contain the English translation of the original input. You may use the Microsoft Translator API (http://api.microsofttranslator.com)
to translate the original input to English, and store it in the new column.
Let us know if this helps,
Chris Wendt
Microsoft Translator