Should not, the term "super easy" refers to the new setup programm which now does a lot of checking for you.
If you hacked your zenphoto code for a translation in the admin you have to do it all again since a lot of things change there everytime. If you mean your customized theme, that should not be harmed (of course you need to backup it first).
As said before: We are working on localization and that will be probaly in zenphoto 1.2 (German will be the test language we will add, since I am German, too).