ADDED: with cmake KICAD_MACOSX_APP_BUNDLE option the user can disable
the macOS app bundle creation when compiling on macOS. This permit to
use/install KiCad like any other *nix platform (/usr/bin, /usr/share,
ecc.). By default, cmake build the app bundle.
Prior to release, we will disable languages that don't meet our criteria
(minimum translation > 75%) but we want to keep the languages available
for translation. LINGUAS lists all languages available.
LINGUAS_INSTALL lists just the languages that will be installed for use
in KiCad. Right now they are the same content. This will be changed
prior to v6 release