Add Review Microdata to product

[rodriciru]

Currently, there's no schema markup for review.
Google complains about it, so this PR fixed that.

[Hlavtox]

I think we removed it some time ago. The review data should be put in the header, is not the case?

[rodriciru]

In that case I'm ok, but for me there's no review in any part of the page...

[rodriciru]

Sorry.
There's an AggregateRating (not in my theme), but not the reviews (in classic and hummingbird)

[rodriciru]

I made a PR long time ago to expose reviews to use in header. This involves the modification of the template, but it is still open...
Maybe its outdated now...
#140

[kpodemski]

Hi @rodriciru

I think it is not needed anymore, as we should have reviews info in JSON-LD :)

[rodriciru]

Great. But as for the moment, there's no such info (not even in the JSON_LD) this fix that for all templates that use this module.
Or we can look at other PR that adds this info to be used in the JSON-LD #140

[matks]

@Hlavtox @kpodemski @rodriciru How can we move forward? Looks like discussion is stuck on a disagreement

[Hlavtox]

I will summarize.

• In https://github.com/PrestaShop/classic-theme/blob/develop/templates/_partials/microdata/product-jsonld.tpl, there is a rating microdata provided in a limited form.
• I agree that adding more structured data is always good.
• We removed all inline microdata in previous versions of Prestashop, it's not good to clutter the code with them. They should be in the header.
• So, can we use displayHeader for this purpose @rodriciru?

[rodriciru]

I will summarize.

* In https://github.com/PrestaShop/classic-theme/blob/develop/templates/_partials/microdata/product-jsonld.tpl, there is a rating microdata provided in a limited form.

* I agree that adding more structured data is always good.

* We removed all inline microdata in previous versions of Prestashop, it's not good to clutter the code with them. They should be in the header.

* So, can we use `displayHeader` for this purpose @rodriciru?

I'm not a PrestaShop dev, so my understanding of PrestaShop is limited. Anyway, I do my best

Anyway, if has such info in microdata is a problem, we can close this PR and look to this PR #140 which populates comments, and reviews, so every template can make use of it in the way the want