shortcuts: Update side nav strings

Bug: b:216049298
Change-Id: I8750032ca48cbcd3b9c86c6aa8b3262902938a53
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4568797


Auto-Submit: Jimmy Gong <jimmyxgong@chromium.org>
Commit-Queue: Jimmy Gong <jimmyxgong@chromium.org>
Commit-Queue: David Padlipsky <dpad@google.com>
Reviewed-by: David Padlipsky <dpad@google.com>
Cr-Commit-Position: refs/heads/main@{#1149441}