Bug#931171: translations in wrong package

[Harald Sitter]

Package: libpwquality1

$ apt show libpwquality1|grep Depends
Depends: libc6 (>= 2.14), libcrack2 (>= 2.8.12), libpwquality-common

libpwquality-common depends on nothing.

the library meanwhile has pwquality_strerror(...) which is meant to
provide localized error strings for display. except it can't because
the translations are in libpwquality-tools which is not pulled in.

translations should be in common package so the library can actually
construct useful error strings.

this bug effectively renders translations unavailable by default