Many would have come into a situation to change the Language on the fly without logging out everytime.
Use the below code after your link to change the language.
Here fr refers to the French Language.
So similarly you can change for other languages :)
But remember only the default values of the OBIEE Application will be changed, but if you need to change the column names, you need to have a translation table for that (multi-lingual feature).
Hope this helps :)