@[email protected] When I type @ I get a user picker in the text interface that autocompletes the username, and then it just generates the link in Markdown. The link does not need to be generated in Markdown, just typing out that syntax will ping the user. The markdown is required, so users can click the link and view the person’s profile. That user will get a notification in their inbox.

Typing ! and then the name of the comm does a similar thing [email protected]. It will also format it in Markdown, but again, not required because that syntax will be changed into a localized link to the comm.

Localized comment links currently are not a thing, but it is an active discussion. You can view that discussion here: https://github.com/LemmyNet/lemmy/issues/2987 and the underlying issue that causes the lack of localized comment links here: https://github.com/LemmyNet/lemmy/issues/1101