- The old method (link to `?locale=#{l.to_s}`) was not functional for path that already has query params in current path (such as `/user/spree_user/password/edit?reset_password_token=`) ;
- This seems that the best way to handle this, is to create a new route, new method that effectively set the lang (not the locale actually...) and then redirect_back (ie. using the HTTP_REFERER, with a fallback to `/`)
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