If you want to create your own allergy translation card if they wasn't already one for either your specific allergy or language, then there are a number of sites you can use.

Free sites include:

-Killer Peanut (http://killerpeanut.com/)

-Allergy Global (http://www.allerglobal.com/step2.php?sl=en)

If you are willing to pay for a card (they will be better quality most of the time) then I would recommend:

-Allergy Translation (https://allergytranslation.com/)