Place holder support At other Areas

## Is your enhancement request related to a problem? Please describe

field Place holder is a good place for educating your user in how to use product. Currently are placeholder for question tile. Request to add other placeholders in following order of priority

1. Question body (I can educate user how to write good question)
2. Answer Body (I can educate user how to write good answer)
3. comment body (least priority - I can ask user to be polite, be respectfull etc)

## Describe the solution you'd like

A clear and concise description of what you want to happen.

## Describe alternatives you've considered

A clear and concise description of any alternative solutions or features you've considered.

Commencez par localiser le placeholder existant pour la tuile de question et suivez la manière dont son texte est configuré et rendu. Étendez le même flux au corps de la question, au corps de la réponse et au corps du commentaire, dans l’ordre de priorité demandé, puis vérifiez que chaque éditeur affiche son placeholder configuré.

Rédigé par le modèle d'indexation à partir du texte de l'issue.