Hi,
I am trying to develop a multilingual website in French and English. French is the default language.
Option "Remove the language code of the URL" is on "Yes".French URL is http://nomdedomaine.com and english URL is http://nomdedomaine.com/en/ but when I'm on English language, the link on the french flag is /fr/ instead of / so It created a content duplication

Steps to reproduce the issue

language plugin:
Item Associations: Yes
Add Alternate Meta Tags: Yes
Add x-default Meta Tag: Yes
X-default language: Français (FR)
Remove the language code of the URL: Yes

System information

Joomla! 3.5.1