feat: Update Explore button label (#1901)

# 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/translation.json

@@ -20,7 +20,7 @@
   "shareButton": "Share",
   "Upload": "Upload",
   "Chat": "Chat",
-  "Explore": "Explore",
+  "Explore": "Marketplace",
   "loading": "Loading...",
   "comingSoon": "Coming soon",
   "Viewer": "Viewer",
@@ -34,4 +34,4 @@
   "cancel": "Cancel",
   "next": "Next",
   "previous": "Previous"
-}
+}