[tor-bugs] #15178 [Atlas]: Improve Atlas' error messages

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#15178: Improve Atlas' error messages
-------------------------+---------------------
 Reporter:  phw          |          Owner:  phw
     Type:  enhancement  |         Status:  new
 Priority:  minor        |      Milestone:
Component:  Atlas        |        Version:
 Keywords:               |  Actual Points:
Parent ID:               |         Points:
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 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 [https://atlas.torproject.org/#about this page] that explains what
 type of search queries are supported by Atlas.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15178>
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