Fix installation target for qt.conf

make install failed for targets where DESTDIR was specified because we
were trying to write qt.conf directly into CMAKE_INSTALL_PREFIX.

Reported and fixed by Ryan Schmidt.

Fixes #104
Fix overly greedy regex

Installing tagainijisho 1.0.2 fails when the path to the source code
contains an underscore (which it always does in MacPorts). This is
because of an overly greedy regular expression in i18n/CMakeLists.txt.

Reported and fixed by Ryan Schmidt.

Fixes #103.