remove tcl/tk translations and demo files from distributions

[jjhelmus]

Remove the Tcl/Tk translation files (.msg) and the Tk demos from the distribution artifacts. The former would only be needed in edge cases and the later is never be needed.

closes #1095

[jjhelmus]

On macOS, CPython 3.14, and the debug build, removing these files saves around ~450 kB in the compressed distribution and ~1200 kB when unpacked.

❯ ls -l *.tar.zst
-rw-r--r--@ 1 jjhelmus  staff  30127303 Apr 23 10:55 ref.tar.zst
-rw-r--r--@ 1 jjhelmus  staff  29677725 Apr 23 10:52 smaller.tar.zst
❯ tar xf ref.tar.zst -C ./ref
❯ tar xf smaller.tar.zst -C ./smaller
❯ du -Aks ref
197143  ref
❯ du -Aks smaller
195958  smaller