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You cannot only use a language key for your blog, but also for your feed:en. WordPress also has provided an option, but not easy to maintain.

Wordpress is an unbelievably powerful tool for the online business owner. If you already have a site, all you need to do is add a Wordpress blog to a directory on your domain.
For instance, if your site is at www.yoursite.com, you would simply install Wordpress into a directory like /blog/. [...]

I guess if you read it, my friend, you have doubts about RSS: do I really need to use it? Let’s try to find out it together.
Abbreviation RSS is an acronym for Really Simple Syndication and means a specific way of delivering information from web-pages to your page, PC or blog. «RSS-channel» or «RSS-stream» — [...]