Remove unneeded title attributes. They are (mostly) duplicates of the link text and serve no useful purpose.
Remove the 'Twitter Username' option

After the Twitter sharing buttons was removed in e3198c2 and 93d0a05,
the Twitter username is only used in the Author Profile box.

If child themes wants a Twitter username, they can use:
add_action( "{$prefix}_close_author_box", 'youraction' );