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The DAM for Sitecore only support English out of the box. If you want it in to support another language you have to add the language version to all the DAM for Sitecore related items in the core dababaseand master database.
Core database
/sitecore/client/DamForSitecore
/sitecore/client/Applications/Launchpad/PageSettings/Buttons/ContentEditing/DAM for Sitecore Explorer
/sitecore/content/Applications/Content Editor/Ribbons/Contextual Ribbons/Digizuite/Digizuite
/sitecore/content/Applications/Content Editor/Ribbons/Contextual Ribbons/Digizuite/Digizuite/Synchronization
/sitecore/content/Applications/Content Editor/Ribbons/Contextual Ribbons/Digizuite/Digizuite/Synchronization/Synchronize Asset Silo
/sitecore/content/Applications/Content Editor/Menues/Digizuite/Synchronize configuration
/sitecore/content/Applications/Content Editor/Menues/Digizuite/Synchronize assets
/sitecore/system/Dictionary/DamForSitecore
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