Userstyles TableView+Enhancer - Dark-Grey: GreasyFork,How to style the "language-selector-locale"?

About: Userstyles / Greasy Fork Enhancer Dark-Grey v.116
edited March 2017 in Style Reviews Waterfox
I want it became shorter.
I styled it with this Userstyle, but i can't change the item selected shown when the menu is closed...
What is its selector?
I try many things but ...
Maybe a placehoder ?
I don't know.
can you help ?
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