(De)crescendo text renders incorrectly

[Hilary Snaden]

Lilypond 2.12.2 on windoze. Custom (de)crescendo text always renders in 
italics. It would be good to be able to use normal (non-italic) text.

\version "2.12.2"
\relative a' {
  \set crescendoText = \markup { louden }
  \set crescendoSpanner = #'text
  \set decrescendoText = \markup { soften }
  \set decrescendoSpanner = #'text
  a\< b c d e\> d c b a1\!
}

--
Hilary