The DAM for Sitecore module's default language is English. To add a new language you have to go through 2 processes:
- Create a new silo language and synchronize. (Be aware that, if the language does not exists in Digizuite DAM, is will synchronize in English).
- In the core database add the language to all the DAM for Sitecore related items.
1 Create new silo language
sdfdfg