Information in aria-label incorrect for reviews in plugin details

[TacoVerdo]

Problem description
In the admin on the plugin install screen, you can open details for a plugin. If the plugin has reviews, they're shown in the details.
When shown, the type of review and the number of reviews for the type are shown. For example a plugin that has 1300 5-star reviews will show that information.

The text '5 stars' is linking to an overview page of all 5-star reviews. The link contains an aria-label -attribute that contains the same information, except that the number of reviews is incorrect as it always says '1'.

Cause
In https://core.trac.wordpress.org/browser/trunk/src/wp-admin/includes/plugin-install.php#L588 the function number_format_i18n() is used in combination with the variable %2$d in the sprintf which expects a digit. Since number_format_i18n() returns a string, the variable will always be '1'.

Possible solution
By removing number_format_i18n() from https://core.trac.wordpress.org/browser/trunk/src/wp-admin/includes/plugin-install.php#L590, $ratecount will be a digit again, as the sprintf() expects for %2$d , resulting in the correct number to be displayed.

Removing the formatting shouldn't negatively influence the way screenreaders read the number, so it shouldn't pose a problem. (Tested with OSX's Voice-Over)

[TacoVerdo]

Example screenshots

[SergeyBiryukov]

Introduced in [36618]. 36395.patch​ looks good.

[ocean90]

In 37156:

Plugins: Use correct placeholder for the number of reviews.

number_format_i18n() returns a string, not an integer.

See #35111.
Fixes #36395.