Dominik Schilling e7d0b4a0fa Update/Install: Replace "error" and "-1" failure messages with a more meaningful one.
* "-1" is an invalid nonce error, show 'An error has occurred. Please reload the page and try again.'.
* "error" means that the connection to the server was lost, show 'Connection lost or the server is busy. Please try again later.'.
* Escape the message in `wp-updates-admin-notice` because the response may include HTML.
* Remove HTML tags in `wp.updates.isValidResponse()` to make PHP's error messages more readable.

Merge of [38205] to the 4.6 branch.

Props azaozz for review.
See #37583.

git-svn-id: https://develop.svn.wordpress.org/branches/4.6@38206 602fd350-edb4-49c9-b593-d223f7449a82
2016-08-05 19:29:31 +00:00
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