When you install a language pack in Alfresco, some of the standard folders change their name to their localized counterpart. One example is the Sites folder, which e.g. in Japanese Alfresco instances becomes /サイト.
The current code hardcodes "Sites" in its queries to Alfresco, making it incompatible with non-English instances.
See this SO question
We will review this issue, currently exists a open ticket about this problem.