[Catalyst] Where should constraints go

[Matt S Trout]

Ian Docherty wrote:
> This is pretty much what I do via the FormValidator. I convert the 
> 'missing' or the 'invalid' messages that it produces into the flags
> 
> [% missing.user_username %]
> and
> [% invalid.user_username.length %]
> which then result in the error messages being produced.
> 
> I still need to give some thought to internationalisation, but that is 
> another question. :)

Since C::P::I18N relies on stuff that expects a dictionary per thing, I've 
rather enjoyed

$c->localize("Created [_quant,...]", $created);

and similar for use in Reaction

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