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fixes musl build, patch from sabotage.

fix various idiotic constructs. patches are mostly from sabotage,
but some I wrote myself too.

in alpine we have gnu gettext with libintl, so remove the dummy
wrappers as they would otherwise cause conflicts.

Display route path using TCP probes

ruby does not work witout it

fixes #2261

many bug fixes. rebase the theme patch too.

Picked from 11-stable branch, and is already in 11.6.0-rc1.
But I need it early for testing.