Fixes https://github.com/vector-im/riot-web/issues/5689
Some dialogs had their own CSS that prevented the buttons from being placed in the right spot. This has been fixed by using a generic standard for the buttons. The only strange dialog that needed more CSS was the devtools dialog due to the header.
Not all dialogs have been checked - I spot-checked about half of them and verified the CSS manually on an established account. It's hard to get at all the dialogs without convoluted testing.
* Make the 'delete my data' button not the default
* Make it red
* Give it a confirmation dialog
* Remove the 'cancel' button: what does it mean to cancel an error?
In this case, it tried again and almost certainly got the same error.
* Remove the top-right 'x' and don't cancel on esc for the same reason.
* Move 'send bug report' to a button rather than a 'click here' link
* Add a 'refresh' button which, even if it's no more likely to work,
will at least look like it's doing something (it's mostly so if you
don't have a bug report endpoint, there's still a button other
than the one that deletes all your data).
Travis Ralston