You can change all backend labels from Administration
>> Interface Labels & Messages
. In the BETA
this will not allow you to switch between two or more languages. In the future you will be able to translate entire backend
from Interface Labels & Messages
in different languages and event more creating your own language packs. Interface Labels & Messages will provide option for importing and exporting language packs that you can use with another projects. The section also provides option for using Google Analytics for translating custom or default labels. We have added all messages in resource files and created this section to provide an easy way for translators and users that are going to work with UI only to change all labels and messages very quickly without using Visual Studio or any file system files.
To summarize the above and my previous replies - in the BETA you can change labels text, but you do not have real localization and it is not possible to switch between two or more different languages. The section Interface Labels & Messages
gives you basic idea of how Sitefinity's 4.0 Localization will work.
Let me know if you have any further questions in this matter.
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