Bug: HTML tag `lang` attribute missing

[quinnmcphail]

Description

The html tag is missing the lang attribute, which causes accessibility issues.

Steps to Reproduce

Steps to reproduce the behavior:

1. Go to any page of the site
2. View the source code of the page
3. See that the root html tag does not contain a lang attribute

Expected Behavior

When viewing any page on the site, the lang attribute is present on the root html tag.

Device & Browser Details

• Device: any
• Operating system: any
• Browser: any

Additional Context

Additional i18n needs to be considered in the future, but the basic i18n configuration can be set up to accommodate basic accessibility concerns.