If you currently use AdSense in a language that Analytics doesn't support, you can still link your AdSense account to Analytics.
If you don't already have an Analytics account, you'll need to sign up for one before linking by visiting http://www.google.com/analytics. Once you've created an Analytics account, you can set its display language from within your account.
If you've already signed up for Analytics, you don't need to do anything. After clicking the integration link in your AdSense account, the following screens walking you through the AdSense-Analytics linking process will appear in the language you already use for Analytics.