Language String stored where?

[inspi2012]

I have spent much of time to search and change wording in admin setting - Language String. Could you please where are my changes stored? Database? I noticed for a couple of times, all my changes were reverted back to original and I had to do it again.

[Chuck S]

The strings are in the database and the only way they could be reverted is if you did not change them to begin with or actually choose to restore them.