Those are fields used by the language switcher to correlate pages across
different languages, even if they have different names/paths/titles.
They are generated with the prepare_for_translation.py script.
- mark all code blocks with ```
- unify empty lines between sections
- adjust list syntax (no space before dash)
- adjust headers to use Atx-style syntax
- remove trailing spaces
Allow getting all the properties at once, to limit number of Admin API
calls. Client should be prepared to handle the case when the call isn't
available (too old version, refused by the policy etc) and fallback to
getting properties one by one.
