Learn French: L'accent régional s'entend ici. - The regional accent can be heard here.

In French, when an inanimate object (like l'accent régional) is the subject of an action usually done by a person, we often use a reflexive pronoun (s') to create a passive meaning. This is called the pronominal passive. It sounds much more natural in this sentence than est entendu, especially for a general statement.

The English translation says "can be heard", but where is the French word for "can" (pouvoir)?

The pronominal passive structure often translates to "can be [verb]" in English, without needing the verb pouvoir. Saying s'entend naturally implies that the accent is noticeable or able to be heard, rather than just stating the literal fact that someone is hearing it right now.

Could a person be the subject of s'entendre to mean they are heard?

No, this specific passive meaning only works with inanimate objects or abstract concepts. If you use a person as the subject, like Il s'entend, it means something else entirely, such as "He hears himself" or "He gets along" (like in Ils s'entendent bien - They get along well).

If the subject were plural, how would the verb change?

The verb conjugates to match the subject just like any normal verb. If the subject were plural, like les accents régionaux, the verb would become s'entendent (e.g., Les accents régionaux s'entendent ici).