[openstreetmap/openstreetmap-website] Stray <br/> in 'confirmation email resent'-message (#3215)

[Andy Allan]

I wasn't aware of this particular error, but I've wrestled with html in our flash messages before and it's a bit of a nightmare. 

Rails flash [only allows](https://api.rubyonrails.org/classes/ActionDispatch/Flash.html) `String`, `Array` and `Hash` as flash objects, notably not `SafeBuffer`. So if we output the raw string (via `raw` or marking it as `.html_safe`) then we get problems like https://github.com/openstreetmap/openstreetmap-website/issues/1027 . If we let rails escape the `String`, then we get problems like this issue.

I'm not sure what the best approach is, so any suggestions are welcome.

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