I've filed a support request on drupal.org about this question, but I figured I should ask here as well because someone could know the answer.
I want to change the "Read more" link in teasers so that it says "Full story". I was pointed to the String Overrides module which supposedly makes it very simple to change the built-in strings. The UI isn't very complicated, so I'm not sure what I could possibly be doing wrong, but it's not working. I have saved the settings, flushed all caches, etc.
Do you have any idea?