Focus on name text area whenever user clicks on Add Subgroup

CHANGELOG.md

@@ -246,6 +246,7 @@ Note that this project **does not** adhere to [Semantic Versioning](http://semve
 - We added a 'LaTeX citations' tab to the entry editor, to search for citations to the active entry in the LaTeX file directory. It can be disabled in the preferences dialog.
 - We added an option in preferences to allow for integers in field "edition" when running database in bibtex mode. [#4680](https://github.com/JabRef/jabref/issues/4680)
 - We added the ability to use negation in export filter layouts. [#5138](https://github.com/JabRef/jabref/pull/5138)
+-Focus on Name Area instead of 'OK' button whenever user presses 'Add subgroup'
 
 ### Fixed