In core ticket #28206, the editor was modified to have a Link Text field instead of a Title field.

This plugin adds the Title field back.

1.3

• Fix the updateFields issue. When you click on a link from the search results, it should now populate the title correctly, like the old versions did.

1.2

• Changed the JS to use original wpLink functions for everything except htmlUpdate, to improve compatibility. Ref: https://core.trac.wordpress.org/ticket/32180
• Fix issue with title field not resetting on a new link

1.1

• Rewrite mostly by SergeyBiryukov to be somewhat smaller and more forward compatible.

1.0

• First version.

1. Upload the files to the /wp-content/plugins/restore-link-title-field/ directory or install through WordPress directly.
2. Activate the "Restore Link Title Field" plugin through the 'Plugins' menu in WordPress