[development] t() placeholder changes in HEAD

[Morbus Iff]

> A rather big patch was committed which affects t() in HEAD and thus 
> pretty much every module out there. It's related to XSS and proper 
> output conversion of text, so do pay attention ;).

What was the nid for this? I'd like to know the reasoning/discussion 
behind using the existing % for the least obvious (theme_placeholder) 
and the new and entirely unknown @ for the most obvious (check_plain).

-- 
Morbus Iff ( think about the good things that I did for you )
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