You can try to re-install the OS. Boot to Recovery partition and re-install OS, don't reformat the drive. What this will do is keep all of your files, settings, and apps but re-install all of the stuff that comes with the OS. It will take an hour or two, depending on network speed.
I had issues like this a few years ago when trying to use utilities to remove extraneous language support and other bloat in order to save disk space. In the end, it wasn't worth it to keep trying so i left it alone.