Now Google has come from behind to help you with faster and easier translation, translation search, bilingual dictionaries and terminology databases which are custom for you.
In order to use the features, and translate your keywords, ad text by uploading AdWords Editor Archive (AEA) into Google Translator Toolkit.
Once you are done with translating work, you can get the campaign back and upload into your AdWords Editor.
AdWords Traffic Estimator.
Inside AdWords: Translate your AdWords campaigns with Translator Toolkit Sphere: Related Content