strings: Replace model.bmp with device.bmp

As we are using per-device OS builds, we should display the device name
in the firmware UI footer instead of the product name. Therefore,
replace the model.bmp ("Product:") with device.bmp ("Device:").

From boards.yaml, currently only 50 locales are used (including en). The
new "device" string is translated for 50 languages (excluding en), where
the sr-Latn translation isn't used by any boards.

BUG=b:478879402
TEST=emerge-rauru chromeos-bmpblk
BRANCH=fatcat

Cq-Depend: chromium:7862480
Change-Id: Ia0676fb4da6bea42ba4e2a1b31d505b5a8a4208d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/bmpblk/+/7862361
Reviewed-by: Jon Murphy <jpmurphy@google.com>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: Yu-Ping Wu <yupingso@chromium.org>
Commit-Queue: Yu-Ping Wu <yupingso@chromium.org>
GitOrigin-RevId: ebb793c6131e3603e585bee2fa5c1c9b04cc92ec