Thx for your reply.
Actually the first link you suggested is the "older thread" that I checked and mentioned in my question.
I don't need to change the language of the accesspoint page itself nor in the management console, rather the context menu language in an application opened from access point.
I was able to do that by adding the InterfaceLanguage=French in the Settings.ini file as suggested in the first link.
However I wanted to know if this can also be applied in some way when opening the qvw using IE plugin, as it works only in AJAX.