JabRef 3.8.2:

The old implementation is available at https://github.com/JabRef/jabref/commit/88bae8571a5afc0ba9967745f57d74347db112ad. Maybe, this some sort of inspiration.
Hi, I am interested in this issue.
If no one is working on this issue, I'll try to work on it these two days.^_^
Hi, I have add the menu items as following:

Is it enough or it needs more other menu items?
@Hollyqqqqq Thanks, that looks good to me! That should be sufficient for the moment
OK^_^
I will try to write some tests, and then create pr.
Sorry, I got stucked into how to run tests although I have some ideas to write tests. There are always errors like "Error(19, 33) java: program package org.jabref.logic.journals not exist" when running both original tests and the tests I added. I have troubles to solve these errors.
Then, I will just create pr for codes that fix this issue and skip the tests codes for the moment.
Thanks to @Hollyqqqqq this is now implemented in the latest development version. Could you please check the build from http://builds.jabref.org/master/. Thanks! Please remember to make a backup of your library before trying-out this version.