Feature/library show number of mangas in category (#269)

* Pass optional browser tab only title

Makes it possible to have a different title for the "NavBar" and the browser tab

* Show number of items in category and library

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Co-authored-by: schroda <github@dasch.simplelogin.com>

src/i18n/locale/en.json

@@ -268,6 +268,12 @@
             "unread_badges": "Unread Badges"
           },
           "title": "Badges"
+        },
+        "tab": {
+          "title": "Tabs",
+          "label": {
+            "show_number_of_items": "Show number of items"
+          }
         }
       },
       "sort": {