chore: improve i18n

src/assets/i18n/en.json

@@ -259,13 +259,20 @@
         "TITLE": "Portal not found",
         "DESCRIPTION": "Please check the credentials and portal url in playlist settings or remove it."
       },
+      "EMPTY_CATEGORY": {
+        "TITLE": "Empty category",
+        "DESCRIPTION": "This category has no content, please select another category or change the content type"
+      },
+      "UNKNOWN_ERROR": {
+        "TITLE": "Something went wrong",
+        "DESCRIPTION": "Unknown error, please try again later"
+      },
       "PLAYLIST_SETTINGS": "Playlist Settings",
       "HOME": "Home",
       "DELETE": "Delete"
     },
     "EMPTY_LIST_VIEW": {
-      "NO_SEARCH_RESULTS": "Nothing found, try to change you search request",
-      "EMPTY_CATEGORY": "This category is empty, try another one"
+      "NO_SEARCH_RESULTS": "Nothing found, try to change you search request"
     },
     "STREAM_URL_COPIED": "Stream URL copied to clipboard",
     "COPY_STREAM_URL": "Copy Stream URL"