Set html language attribute without modifying index.html

Any way to set html language attribute -<html lang="es"> without editing index.html file?
Modifying index.html file every time I update the web it’s annoying and a waste of time.
What do you do if your page is written in another language but english?
Thanks in advance.

Depends on the theme, Foundation has this option in the Site Styles stack.

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A short JavaScript snippet would do the job. But if it is sufficient depends on the crawler, which is examine your site.

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Thanks Jannis. I will give javaScript a try. It seems a great idea.