add favorite books section to favorite tab

tmp

src/strings/de.json

@@ -1412,6 +1412,7 @@
     "Whitelist": "Erlaubt",
     "AuthProviderHelp": "Auswählen eines Authentifizierungsanbieter, der zur Authentifizierung des Passworts dieses Benutzes verwendet werden soll",
     "Features": "Features",
+    "HeaderFavoriteBooks": "Lieblingsbücher",
     "HeaderFavoriteMovies": "Lieblingsfilme",
     "HeaderFavoriteShows": "Lieblingsserien",
     "HeaderFavoriteEpisodes": "Lieblingsepisoden",

src/strings/en-gb.json

@@ -385,6 +385,7 @@
     "HeaderEpisodes": "Episodes",
     "HeaderError": "Error",
     "HeaderExternalIds": "External IDs:",
+    "HeaderFavoriteBooks": "Favourite Books",
     "HeaderFavoriteMovies": "Favourite Movies",
     "HeaderFavoriteShows": "Favourite Shows",
     "HeaderFavoriteEpisodes": "Favourite Episodes",

src/strings/en-us.json

@@ -351,6 +351,7 @@
     "HeaderEpisodes": "Episodes",
     "HeaderError": "Error",
     "HeaderExternalIds": "External IDs:",
+    "HeaderFavoriteBooks": "Favorite Books",
     "HeaderFavoriteMovies": "Favorite Movies",
     "HeaderFavoriteShows": "Favorite Shows",
     "HeaderFavoriteEpisodes": "Favorite Episodes",