feat: add new book categories

Closes #147

src/things/book.ts

@@ -39,11 +39,13 @@ import {
  */
 export type SCBookCategories =
   | 'audio'
+  | 'audiobook'
   | 'book'
   | 'cd'
   | 'dvd'
-  | 'ePhoto'
+  | 'eAudiobook'
   | 'ebook'
+  | 'ePhoto'
   | 'hierarchy'
   | 'kit'
   | 'manuscript'
@@ -169,11 +171,13 @@ export class SCBookMeta extends SCThingMeta implements SCMetaTranslations<SCBook
       ...new SCThingThatCanBeOfferedMeta<SCAcademicPriceGroup>().fieldValueTranslations.de,
       categories: {
         audio: 'Tonträger',
+        audiobook: 'Hörbuch',
         book: 'Buch',
         cd: 'CD',
         dvd: 'DVD',
-        ePhoto: 'E-Photo',
+        eAudiobook: 'E-Hörbuch',
         ebook: 'E-Book',
+        ePhoto: 'E-Photo',
         hierarchy: 'mehrteiliges Werk',
         kit: 'Medienkombination',
         manuscript: 'Handschrift',
@@ -199,11 +203,13 @@ export class SCBookMeta extends SCThingMeta implements SCMetaTranslations<SCBook
       type: SCThingType.Book,
       categories: {
         audio: 'audio material',
+        audiobook: 'audiobook',
         book: 'book',
         cd: 'CD',
         dvd: 'DVD',
-        ePhoto: 'E-Photo',
+        eAudiobook: 'E-Audiobook',
         ebook: 'E-Book',
+        ePhoto: 'E-Photo',
         hierarchy: 'multipart item',
         kit: 'media combination',
         manuscript: 'manuscript',