nopCommerce Administration Localization
Currently there is no way to change the language that the nopCommerce Administrative section is displayed in. I have issued a couple of feature requests regarding this issue. However, as of today there are no plans to build that functionality in.
You can read the most up to date information on this at the official nopCommerce blog on Administrative Localization.
I will also stay up to date on this one and post more information as it becomes available. Please leave a comment if you would like to know more, or if you have any information to add to this discussion.