## Description
Certain types allow empty values, which then will be replaced with their default value:
* Date: default value is today's date
* Wikidata item: default value is the page associated Wikidata item
* Natural languaguage: default value is the page language
According to design research and usability improvements, we want to implement a clearer way to set empty values that informs the editors of the expected behavior
{F65776143}
**Desired behavior/Acceptance criteria**
* [ ] Types that allow default values, will be shown with a checkbox below the field with a clear message
* [ ] On checking the checkbox, the field will be set to empty and disabled
* [ ] On submitting the configuration, the field will be set to an empty string
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## Completion checklist
* [ ] Before closing this task, review one by one the checklist available here: https://www.mediawiki.org/wiki/Abstract_Wikipedia_team/Definition_of_Done#Front-end_Task/Bug_Completion_Checklist