Adding a domain from the query log opens a modal that, on any HTTP
error, showed a fixed "Timeout or Network Connection Error!" text. The
most common case - the domain is already on the list - is returned by
FTL as HTTP 400 with `{"error":{"hint":"The item is already present"}}`,
so it surfaced as a misleading network error.
We now read the JSON error body and show its hint (or message), falling
back to the network-error text only when there genuinely is no response
body.
Signed-off-by: DL6ER <dl6er@dl6er.de>
DL6ER
c3b3db257e