misc: unify terminology

{can't, won't} → unable to
plateform → platform

Change-Id: I7723ac5ed881572201fb8367f1e5c84c52330888
GitLab: jami-client-qt#1730

CMakeLists.txt

@@ -179,7 +179,7 @@ if (DNC_SYSTEMD AND BUILD_TOOLS AND NOT MSVC)
 
         install (FILES tools/dnc/dnc.yaml DESTINATION ${sysconfdir}/dhtnet/)
     else()
-        message(WARNING "Systemd unit installation directory not found. The systemd unit won't be installed.")
+        message(WARNING "Systemd unit installation directory not found. The systemd unit is unable to be installed.")
     endif()
 endif()
 # Sources

Packaging.md

 # Packaging and release
 
-In `extras/packaging`, you will find a `build_packages.sh` script which will build packages for supported plateform. You must provide as argument the OS for which you want to build. You can't specify the plateform (arm64, x86, ...) as you can compile only for the same plateform as the one you are running on.
+In `extras/packaging`, the `build_packages.sh` script will build packages for supported platforms. The OS argument must be provided. The platform architecture (arm64, x86, …) is unable to be specified as packages will only be compiled and built on the platform that the build runs on.
 
 **Usage:**
 ```bash
-extras/packaging/build_packages.sh -a  # -a or --all will build all plateform which are known to be supported
+extras/packaging/build_packages.sh -a  # -a or --all will build all platform which are known to be supported
 extras/packaging/build_packages.sh -u  # -u or --ubuntu will build for all supported versions of Ubuntu
 extras/packaging/build_packages.sh -u22 -d11  # -u22 will build for ubuntu 22.04 and -d11 will build for Debian 11
 ```