Note, that "This sentence is written in English" is not about the meaning of a sentence but about its encoding. Statements about Truth are about the meaning of something.
What does "This" in the above sentence refer to? It refers to the expression of an idea, how the idea is written, in what language. It does not refer to the idea, or the meaning of the sentence, what we think of as the "sentence" (vs. its encoding). Therefore I would say it is not self-referential sentence, or if it is in a very different way than "This" in "This sentence is false".
What does "This" in the above sentence refer to? It refers to the expression of an idea, how the idea is written, in what language. It does not refer to the idea, or the meaning of the sentence, what we think of as the "sentence" (vs. its encoding). Therefore I would say it is not self-referential sentence, or if it is in a very different way than "This" in "This sentence is false".