If you revert them, you will lose all modifications you did to your template. What I usually do is go to edit my template, then hit Template History (I think that's the name, it's in the upper left corner) and then up comes a screen to compare templates. It should have your current template and the default template selected. You can then have it compare the two and you can see the differences. From that you can copy/paste the changes to your template and save it.
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