Translations don't compile correctly on windows

[X-sam]

This is a minor issue, and doesn't impact our automated builds (as they only run translation generation on linux), but for users wishing to complete the development flow on Windows, ayab_trans.pl relies on system calls to cut and rm, neither of which exist in Windows environments. We should refactor this to use perl-native functionality which will properly function cross-platform.
Additionally, the setup instructions for Windows do not result in lrelease being in the path, so we need to figure out a workaround there.