[openstreetmap-website] Don't treat flash messages as raw (618526b)

[Simon Legner]

The English text of the following two message ids contains a HTML entity which is now incorrectly displayed.
* `user.confirm_resend.success`
* `user.new.terms declined`

(This has been obtained w/ the following script: https://gist.github.com/c5ef9316ba854b1ff571)

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https://github.com/openstreetmap/openstreetmap-website/commit/618526ba6297895d5ed4aaf04766afaab2f46544#commitcomment-12933973
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