Implement create approval voting

[selankon]

Fix https://github.com/vocdoni/ui-scaffold/issues/595

Implements approval voting on process creation form.

• Refactor approval voting as implemented feature
• Implements components for SingleChoice or ApprovalVoting on questions page
• It implements refactors in order to share components structure between pages and question types

It refactors a bit to reuse the code from Census type form and create generic components to use also on Questions pages. This is because both had same structure (a tab screen with a list of implemented an unimplemented features).

Refactor of question types

The old index.tsx that implements the logic for the single choice questions is moved inside the Question.tsx file, creating a QuestionsPage component shared between the questions types.

So using this new component it implements two new questions types:

• SingleChoice
• ApprovalVoting

What is refactored from Census form?

Using as example the Census.tsx component, I created the more generic TabsPage component which is basically an skeleton for a page that have:

• Title and description
• A list of implemented feature tabs
• A list of unimplemented features tabs that open a modal

This is how it looks like

https://github.com/vocdoni/ui-scaffold/blob/7927f33e7cb88948c417863f31ddf60f90269a17/src/components/ProcessCreate/Steps/Census.tsx#L12-L39

This component is used on the Questions step and on the Census step.

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[selankon]

Missing translations and we should select, by default, the "Single choice" voting, instead of none:

@jpaulet added translations and set default to single choice

[elboletaire]

This is still shown without proper interpolation of html tags