From the ICO cookie guidance
For example, some websites ‘remember’ which version a user wants to access such as a version of a site in a particular language. If this feature is enabled by the storage of a cookie, then you could explain this to the user and that it will mean you won’t ask them every time they visit the site. You can explain to them that by allowing you to remember their choice they are giving you consent to set the cookie. Agreement for the cookie could therefore be seamlessly integrated with the choice the user is already making.
Really, how ridiculous can a law be! Of course, offering multilingual websites is just a sneaky way to collect sensitive prefered language info from our visitors...
A while ago I read about how cookies needed for the functioning of the website would be excluded from the consent rule, but apparantly not.