i18n module: Invoke itstool with the full command line

Certain envs may not support invoking itstool by itself directly as a script
as shebang lines are not supported, such as under cmd.exe shells on Windows,
that are normally used for Visual Studio (and the like, such as clang-cl)
builds.

This will call the corresponding interpreter to invoke itstool when needed, so
that itstool can be properly run, even if shebang lines are not supported by
the env.

This will fix building appstream on Windows using clang-cl, for instance.

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