This is something I have never come across.
A few questions:
- Why is the only page to be in spanish the careers page?
- Why not the rest?
- What if their english isn't good enough to get to the careers page?
I don't see why the whole site wouldn't be available in the languages you need. If a user lands on the site looking for a job and realises the site isn't in the language they need, will they progress to the careers page or get there quickly? Is this something you know based on analytics or have tested that happens?
The platforms I work on, the entire site is available in the languages required based on our user base and target audience to help them get to where they need in their native language. This helps for the conversions we want them to achieve.