fix(frontend): small rephrase (#2699)

# Description

Please include a summary of the changes and the related issue. Please
also include relevant motivation and context.

## Checklist before requesting a review

Please delete options that are not relevant.

- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my code
- [ ] I have commented hard-to-understand areas
- [ ] I have ideally added tests that prove my fix is effective or that
my feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged

## Screenshots (if appropriate):

frontend/public/locales/en/chat.json

@@ -61,7 +61,7 @@
   "threads": "Threads",
   "title": "Chat with {{brain}}",
   "today": "Today",
-  "tooManyRequests": "You have exceeded the number of requests per day. To continue chatting, please upgrade your account or come back tomorrow.",
+  "tooManyRequests": "You have exceeded the number of requests per day. To continue chatting, please upgrade your account.",
   "welcome": "Welcome",
   "yesterday": "Yesterday"
 }