[FIX] definition of badges
[FIX] the badges should be ordered by most popular first
[FIX] remove closing reason 'an answer was accepted', the questions should be left as open to be possible to improve the answer afterward
[IMP] as the closing reason is not required, do not display it if none is present
[IMP] display the createion date of the question the same way we display the answer fate
[FIX] website_forum: correct goal definition and other improvement

- scholar: the field is_correct is on the answer, not on the question
- remove closing reason 'an answer was accepted', the questions should be left as open to be possible to improve the answer afterward
- sort badges by most frequent first
- display the creation date of the question the same way we display the answer date
[FIX] account_analytic_analysis: use product.price if pricelist is passed, else list_price