Improve Atlas' error messages
Whenever Onionoo is offline, Atlas shows an error message:
Backend error! The backend server replied with an error to your query. This probably means that you did not properly format your query. If your query was properly formatted it may mean that there is an issue with your browser/add-ons. Please report which browser/addons/etc. you're using to the bug tracker.
This suggests that the user made a mistake, which results in several trac tickets every time Onionoo is offline. We should improve the error message and make it clear that waiting a little bit might solve the problem. Here's a suggestion:
Backend error! Atlas is unable to get a response from its backend server. This probably means that the backend server is unavailable right now. This can also happen, however, if you did not format your query correctly. Please have a look at this page that explains what type of search queries are supported by Atlas.