Language support has always been in AX and with the new Dynamics AX it’s still there as a user option. Instead of having to re-start the client the user can just change the setting and refresh the browser.
Here is a quick look
AX Build 7.0.1265.3015
Keep in mind at this initial release we support 40 languages but support of right to left languages is coming in a later update.
Cheers
Lachlan