Wrong lang ressource bundles

It seems that sometimes the ressurce bundles called in templates depends on the local language of the navigator and not on the site language version

For instance :

• create a site in two languages (fr / en)
• open a navigator which default lang is french
• open another navigator which default lang is english

go to the home of community templates with both, call the french versin of the page
with the french navigator the label is "envoyer"
with the english navigator the label is "submit query"

I wish you could explain here how to correct this, if we find the same problem elswhere WG3 must be able to correct it by itself. thanks