Validation successful message is misleading

[raquelalegre]

Describe the problem
When validating a file that has errors, a "Validation successful" message appears on top of the console log, blocking its view.

To Reproduce
@EleanorRobson is looking into how to reproduce this problem.

Expected behavior
If the message is just about the connection to the server and the validation result having been received, the message should say "validation complete" instead of "successful".

Screenshots

Additional context
This problem was reported by @EleanorRobson at our last Oracc meeting.