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
The `parentoptions` heading is missing from the locale string
file. The result is that in the command reference pages, the
second table has no heading. It is weird to see two tables on
the same page without this heading text.