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Issues with language mark up

Hi Guys,

I’m fairly new to webflow. I have built my site and it seems to perform really well.

I have very little knowledge of SEO but when I ran a crawl on the site, one of the main red flags I get is ‘One or more of the specified languages is not ISO standard (en, en-us, de, etc.)’.

Please can someone let me know what this means and how I can rectify it.

Many Thanks