Sorry I cannot find a way to do it with enough granularity.

How can I have a template for title changes, so when the title of an issue changes I can have this on the very first line of the body (or even the subject):

Title has changed from "OLD_SUBJECT" to "NEW_SUBJECT"

There is too much information in email notifications.

It would be nice if the mail was like Redmine:

The first line of the email tells you what has changed in the ticket. Eg: "Status has changed from New to Assigned"

It also includes the last comment (if any).

The rest of the ticket is more or less like the same.