Add a meaning to "More" for translation.

More is being translated as "Expand". Add a meaning to get a better
translation.

Fixed: b:359070567
Change-Id: I9492dd25339d8cf2c6ccfc05995bb59eba224f89
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5782681
Auto-Submit: Darren Shen <shend@chromium.org>
Commit-Queue: Michelle Chen <michellegc@google.com>
Commit-Queue: Darren Shen <shend@chromium.org>
Reviewed-by: Michelle Chen <michellegc@google.com>
Cr-Commit-Position: refs/heads/main@{#1341456}