fix(submissions): surface each linked build's outcome to the submitter

/me/submissions (and the admin queue) now attach build_status/build_error by
a read-only Builder.Get — until now a failed build was visible only on the
admin-tier /images/build routes, so the person who submitted the modpack
never learned the build died. A missing build row renders as "no outcome";
any other lookup failure surfaces instead of being swallowed. The panel's
My Submissions page renders the outcome in the expanded row, localised.

panel/src/i18n/resources/en-US/submissions.json

@@ -19,6 +19,13 @@
   "table_created_at": "Submitted At",
   "table_reviewed_by": "Reviewed By",
   "table_reject_reason": "Reject Reason",
+  "table_build_status": "Build Status",
+  "table_build_error": "Build Error",
+  "build_status_pending": "Queued",
+  "build_status_building": "Building",
+  "build_status_succeeded": "Succeeded",
+  "build_status_failed": "Failed",
+  "build_status_cancelled": "Cancelled",
   "no_submissions_title": "No Submissions Found",
   "no_submissions_hint": "You haven't submitted any modpacks yet.",
   "search_placeholder": "Search submissions...",