Add templates for answering proposals

[microstudi]

Original request

As a process-admin, I would like to be able to store at least one individual response template for each process, built into the response field or below (e.g. customizable with Term Customizer).

Specs

• Add a new template controller (module decidim-templates) and an admin menu "Proposals answers" below the templates for forms (Fig. 2).
• CRUD methods for adding a template (Fig. 3)
• A template must be able to:
  • Store the text of the response, with some variables to interpolate: %{organization} (organization's name), %{name} (proposal author's name), %{admin} (current administrator name). Consider all configured languages
  • Store the status for this response (Not answered, answered, etc)
  • Define the scope for this template: Global (available anywhere), Select a specific Participatory Space.
• Add to the managing proposal answer form a select (Fig. 1) with all the templates available (according to scope: All global + the ones targeting this participatory space). Consider the possibility that the module decidim-templates is not installed, then nothing should shown.
• Specs

Mockups

Fig. 1. Selecting a template answer from a list:

Fig. 2. Managing proposal answers templates

Fig. 3. Creating/editing proposal answers templates

Methodology

Start with the branch release/0.26-stable and create a PR to openpoke/decidim to this very same branch.
In the future we will have to "port" this feature to develop (but this won't be possible until 0.28 is out with the new redesign)