Dynamics CRM has a native amazing capability which allows every single user to use the application in his preferred language by changing personal options.
But first the available languages are just languages added to support by CRM administrator. To add new languages you should go to Settings==>Administration==>Languages then select one or many languages you want to make available for users and click Apply to enable it.
Few minutes later, you can change your user language preference by clicking on Options in the navigation bar.
Click now on the last tab “Languages” and choose another language among the languages you previously enabled. Refresh the home page and check the language change!!