Refactor frontend data models

src-ui/src/app/data/document-metadata.ts

@@ -0,0 +1,15 @@
+export interface DocumentMetadata {
+  original_checksum?: string
+
+  archived_checksum?: string
+
+  original_mime_type?: string
+
+  media_filename?: string
+
+  original_filename?: string
+
+  has_archive_version?: boolean
+
+  lang?: string
+}