Create a list of banned words for automatical reporting

**Is your feature request related to a problem? Please describe.**

Currently users a free to post about anything and moderation mostly relies on the attention span the moderators and the admin can provide. Moderation is rarely done by users.

**Describe the solution you'd like**

The idea is to add some automatic reporting by adding a list banned words. When these words are found in the contribution (meetings, proposals, comments, debate) they are automatically reported. A notification is sent to the moderator which can decide to hide or unreport.

For transparency the list of words should be available for all to see.

**Describe alternatives you've considered**

I'm happy to discuss other ways we can automate this.

**Additional context**

https://meta.decidim.org/processes/roadmap/f/122/proposals/15627

https://meta.decidim.org/processes/roadmap/f/122/proposals/15628

**Does this issue could impact on users private data?**

No

**Funded by**

EU commission.