Add Spanish and Chinese translations

[rachelekm]

Overview

Adds initial Spanish and Chinese translations. Noting there are come missing copy translations following the UX changes over time (documented in the project notes) so we will need a followup, but this PR should act as the first pass of applying all the translations copy.

Also includes small copy updates from client feedback.

Checklist

• fixup! commits have been squashed
• CHANGELOG.md updated with summary of features or fixes, following
  Keep a Changelog guidelines
• README.md updated if necessary to reflect the changes
• Run ./scripts/format to lint, format, and fix the application source code.
• CI passes after rebase

Demo

Screen.Recording.2026-03-10.at.3.16.42.PM.mov

Screen.Recording.2026-03-10.at.3.16.12.PM.mov

Testing Instructions

• scripts/server
• Logout if necessary and set language on homepage to Spanish or Chinese
• Register, move through user profile wizard to setup, and interact with the app so you can verify all copy appropriately translated
• Repeat for alternate language
• Note these will be some copy still in English, but all those should already be recorded in the project notes for a 2nd translations pass

Resolves #732

[aaronxsu]

Looking good to me!

After merging this PR, would you mind creating another issue for the second round of translations after we have them back from the client? Please ignore if there's already one.

Question: for the Region filter, should we also translate North Shore, Metro West, etc? My hunch is no, but I'd like to bring it up and verify.

I also noticed there is a dollar sign $ before "Based on a map by..." in this screenshot. Is it intended?

[rachelekm]

Thanks for the review!

After merging this PR, would you mind creating another issue for the second round of translations after we have them back from the client? Please ignore if there's already one.

Thanks for the reminder, just made one now as a follow-up #809.

Question: for the Region filter, should we also translate North Shore, Metro West, etc? My hunch is no, but I'd like to bring it up and verify.

I'm also going to say no since these are functioning as places all users will colloquially know (similar to the neighborhood names). I'll double check with Steph and we can add it to the remaining translations list for next card if we need them.

I also noticed there is a dollar sign $ before "Based on a map by..." in this screenshot. Is it intended?

Good eye!! Not intended, looks like it's just a little hard-coded typo. I fixed it in the latest rebase e2c5908

[aaronxsu]

Awesome! Good to go 👍🏼