fixing bug #4507

Conflicts:

	config-core/src/main/config/properties/org/silverpeas/multilang/generalMultilang.properties
	config-core/src/main/config/properties/org/silverpeas/multilang/generalMultilang_fr.properties
session #opening #fix :  Merge branch 'master' of github.com:Silverpeas/Silverpeas-Core into session-opening-fix