Add reset search buttons to search forms
**Is your feature request related to a problem? Please describe.**
Decidim implements multiple search forms. There is no easy way to reset the search criteria back to defaults if you don't know how to browse to the same page again.
**Describe the solution you'd like**
I suggest adding a "Reset search" button to all search forms.
**Describe alternatives you've considered**
Browsing back to the same page using navigation but this is not very intuitive given the extremely complex navigational structure of Decidim.
This is an issue that would also improve the accessibility of the system. I understand it is not required to pass accessibility reviews but it would improve accessibility.
**Does this issue could impact on users private data?**
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