feat: add area/localization label to pl OWNERS file
fix: OWNERS with filters should have the approvers and reviewers properties within the filters property
feat: add filters in OWNERS files in <lang> dirs to ensure that they act on only the toml files
feat: ensure OWNERS files have an indent size of 2
I'm not sure why this is defaulted to `false` for all file types,
so this just enables it for YAML for now.
Signed-off-by: Milas Bowman <milas.bowman@docker.com>