Replying here so that others will have the context.
I thought this was weird because the notification tab does not share the same rendering codepath as the others, so I reverted the new quick access feature locally, and can still repro the issue:
I believe this is a super edge case with our client-side I18n.t, and here is a minimal failing test for it: https://github.com/xrav3nz/discourse/commit/3d7324281a285158fe75f9e7b42574906c940e49.
Fixed with: