feat(form-labels): Adds new form labels for dc_publisher e dc_relation_issn

ref: DURACOM-481

Author: AdamF42

src/assets/i18n/en.json5

@@ -7534,6 +7534,10 @@
 
   "form.date-picker.placeholder.day": "Day",
 
+  "form.other-information.dc_publisher": "Publisher",
+
+  "form.other-information.dc_relation_issn": "ISSN",
+
   "item.page.license.title": "Rights and licensing",
 
   "item.page.cc.license.title": "Creative Commons license",