Redturtle.voltoplugin.editablefooter

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

- Nothing changed yet.

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

- Fix it translations
[lucabel]

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

- Fix serializer/deserializer for footerTop blocks: use blocks handlers to fix data.
[cekk]

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

- Revert changes to 1.2.1 branch. We haven't deleted 1.3.0 and 1.3.1 branches because there are some releases on pypi.
[cekk]

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

- Handle missing record in restapi endpoint.
[cekk]

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

- Add footer_top field in settings, to manage a new footer row before columns.
[cekk]