fix: daia availability

src/assets/i18n/de.json

@@ -370,7 +370,8 @@
       "ejournal": "ejournal",
       "unknownAvailability": "Keine Information vorhanden",
       "unavailableAvailability": "System nicht erreichbar",
-      "fulltext": "Zum Volltext"
+      "fulltext": "Zum Volltext",
+      "holdings": "Bestand"
     }
   },
   "schedule": {

src/assets/i18n/en.json

@@ -358,7 +358,7 @@
         "not_available": "not available",
         "library_only": "for use in library only",
         "available": "available",
-        "unknown": "not available"
+        "unknown": "unknown"
       },
       "dueDate": "Due date",
       "location": "Location",
@@ -370,7 +370,8 @@
       "ejournal": "ejournal",
       "unknownAvailability": "No information available",
       "unavailableAvailability": "System unreachable",
-      "fulltext": "Full text"
+      "fulltext": "Full text",
+      "holdings": "Holdings"
     }
   },
   "schedule": {