Hi,
I will put some bugs or suggestions that I encounter here:
-"Forgot password" text is hard-coded in /Modules/CustomerLogin.ascx
-Could Administration be localizable?
-Administration pages should be marked as not to be cached by the browser (<META http-equiv="pragma" content="no-cache">) - lists seems the same after edit and a refresh is needed
-In Modules/CheckoutCompleted.ascx, Line 14, Column 71, there is 'ą' character (it should not be there).
-Sometimes when tehre is old as well as new price in the products list, a line break occurs in the middle of the price.
-For editing user reviews in administration, you use WYSIWYG HTML editor, but the review is displayed with the HTML tags ("<p>Great product!</p>"). So after you edit the review, FCKEditor adds tags and they are displayed then.