re-enable Spanish language selection

[ericnost]

The original CEJST had a Spanish-language version (https://web.archive.org/web/20250121194312/https://screeningtool.geoplatform.gov/es/#3/33.47/-97.5) that was enabled by selecting "Español" from the GovernmentBanner at the top of the screen.

We removed the GovernmentBanner entirely, which means, as far as I'm aware, there's no easy way to find the Spanish-language version.

However, it can still be accessed by switching to /es/ in the URL in place of /en/ https://digitalhistory.github.io/j40-pages/es/#3/33.47/-97.5

The GovernmentBanner is built by a cross-site module, and I'm not familiar enough with it to know whether/how we can modify it to display the language selection but not the "This is a US Government website. Here's how you know" accordion.