Plonemeeting.restapi

----------------

- Nothing changed yet.

----------------

- Adapted call to `get_attendee_short_title` as it was moved
from `Meeting` to `utils`.
[gbastien]

----------------

- Fixed french translation for `create_element_using_ws_rest`.
[gbastien]

----------------

- Adapted `test_restapi_add_item_with_annexes_children` to show that annex
`content_category` `only_pdf` parameter is taken into account.
[gbastien]
- Added `testServiceDelete` to show that the `DELETE` method works as expected.
[gbastien]
- Fixed french translation for `create_element_using_ws_rest_comments`.
[gbastien]

----------------

- When using `fullobjects`, only serialize `next/previous` when specifically
asked using `include_nextprev=true`.
[gbastien]

----------------

- Fixed `test_restapi_add_clean_meeting`, when generating new date use datetime
and timedelta to avoid generating an unexisting date,
here it was generating `2025/02/29` that does not exist.
[gbastien]
- When using `users?extra_include=categories`, categories are only returned if
enabled in `MeetingConfig`, same for `classifiers`, this avoid having
selectable categories for an user when categories are not used.
[gbastien]
- Added special behavior for `review_state` and `creators` when asked in
`metadata_fields`:

- `review_state` will return a token/title with review_state id
and translated title;
- `creators` will return a list of token/title with each creator id
and fullname.

[gbastien]