handle OPDS catalog responses accordingly

- handle moved permanently HTTP 301
- handle authentication required HTTP 401
- handle authentication errors HTTP 403
- handle catalog not found HTTP 404

frontend/ui/widget/opdsbrowser.lua

@@ -298,6 +298,22 @@ function OPDSBrowser:fetchFeed(item_url, username, password, method)
         if xml ~= "" then
             return xml
         end
+    elseif code == 301 then
+        UIManager:show(InfoMessage:new{
+            text = T(_("Catalog has been permanently moved. Update catalog URL to %1"), headers['Location']),
+        })
+    else if code == 401 then
+        UIManager:show(InfoMessage:new{
+            text = T(_("Authentication required for catalog, please add username and password")),
+        })
+    else if code == 403 then
+        UIManager:show(InfoMessage:new{
+            text = T(_("Could not authenticate, check your username and password")),
+        })
+    else if code == 404 then
+        UIManager:show(InfoMessage:new{
+            text = T(_("Catalog not found")),
+        })
     else
         UIManager:show(InfoMessage:new{
             text = T(_("Cannot get catalog. Server code response %1"), code),