\caps with Umlaut

[Jonathan Scholbach]

Dear ponders,

I am using \caps in a \markup which prints the name of the composer.
After having set a couple of pieces today it's the first time the
composer's name contains an umlaut (in this case an ä). And that was
when I found out, that \caps, as well as \smallCaps, "does not support
accented character" (quoted from
http://lilypond.org/doc/v2.19/Documentation/notation/font) - the ä - is
printed as a lowercase letter.

The ME is:

\version "2.19.22"

\markup{ \caps Bartholomäus }

How can I solve this problem? I mean, how can I achieve that \caps works
properly with umlauts and uses the uppercase umlaut?

Your advice is very much appreciated,

Jonathan