Enhancement: Tell user what to do after importing settings file [local server]

[keunes]

I just installed Ferdium 6.0.0-nightly.49 via snap on Ubuntu 18.04.6 LTS. When importing the config file from my old-but-still-used Ferdi installation, Ferdium on a new page acknowledges that the services have been added. However, they are not immediately visible in the front-end app. It would be good to explain what the user should do to make the apps visible.

I restarted Ferdium and that worked, but it'd be good to make this explicit. I was hesitating for a brief moment whether the shown success message was false - mentioning the needed restart takes away any doubt.