As a result of this post, the privilege notification banner now reads
Congrats, you've gained the privilege – edit questions and answers (or whatever other privilege -ed) learn more
That still doesn't seem quite right to me. It's mixing up the definite and indefinite articles, and implying that there is a grand total of one privilege to earn on Stack Exchange sites (there are actually 23). Shouldn't it be either
Congrats, you've gained a privilege – editing questions...
Congrats, you've gained the privilege of editing questions...
When I originally asked this question, I completely forgot about English SE. I've now posted there.