The list item separator is a locale property, and it doesn't make much sense to translate it separately in multiple projects. This changeset implements the following modifications:
- Define list item separator as a new WP_Locale property
- Add `wp_get_list_item_separator()` as a wrapper for `WP_Locale::get_list_item_separator`
- Replace `$wp_locale->get_list_item_separator()` calls with `wp_get_list_item_separator()`
- Added a compatibility layer for bundled themes
Props SergeyBiryukov, swissspidy, rsiddharth, johnbillion, audrasjb.
Fixes#39733.
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