[CentOS] LC_COLLATE variable?

Hi,

I'm running my CentOS 7 desktop in french. LANG is set to fr_FR.UTF-8.

In GNOME 3, the menu entries are listed in alphabetical order. 
Unfortunately, entries beginning with an accented character (like 
"Éditeur de texte") appear at the bottom of the list.

I know that in order to correct this, I have to set the LC_COLLATE 
variable to fr_FR.UTF-8. What would be a sensible place to do this 
system-wide under CentOS 7?

Cheers,

Niki
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