Add a `translate_genders` GN arg and start making build work with gender translations.

This causes GRIT to be invoked with the "--translate-genders" flag when
appropriate.

Chrome as a whole doesn't built when `translate_genders=true` yet, but
`autoninja -C out/Debug components/strings:components_strings_grd`
succeeds, which seems like a decent starting place.

BUG=416291329

Change-Id: Ic2723545ec63d4006770cb0935c072c50c700786
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6519500
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Owners-Override: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Glenn Hartmann <hartmanng@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1457814}