The XS was left only for the unit / integration tests, and it links libslic3r only. No wxWidgets are allowed to be used from Perl starting from now.
Moved the "translate" functions to namespaces to avoid clashes between the code in libslic3r and Slic3r GUI projects.
(the MachineEnvelopeConfig class). Added localization support for libslic3r through a callback (the callback is not registered yet, so the localization does nothing). Localized the Print::validate() error messages.