Google added AdWords campaign support to Google Translator Toolkit, which includes tools like translation search, bilingual dictionaries, and custom terminology databases. To translate your keywords and ad text, upload an AdWords Editor Archive (AEA) file into Toolkit, that automatically translate them. You can then share your translations with your multilingual optimizers or professional translators, who can optimize and localize your campaign through Toolkit’s campaign editor. When you're finished, download your campaign and upload back into AdWords Editor. You can also optimize your keywords and ad text further through AdWords Editor and other tools like AdWords Traffic Estimator, explained AdWords blog.