Revert "Be wary that the default-shortcut-prefix might be"

This reverts commit 47b1195502415067944a2ecedc9742b2ad9dcd6f.
Fix the alt menu conflict in a simple way,
suitable for the release branch
German string constant for install-pkg-not-rentrant.

Please merge to 6.0 release branch.
(cherry picked from commit ddbdebe3628e7df931dbe829375117d2434ad361)
MzCom: fix command-line parsing

I couldn't get MzCOM to work in a release build, because my
installations always had a "-" in the path.

Merge bug fix to v6.0 (pending review)
(cherry picked from commit b7f4e10fe1cb4aea2f616a1977adb522e3ef075d)