Support x+ Million active installs for plugins

[dd32]

A few months ago WordPress.org updated the maximum number of active installs that would be shown for plugins from 1m+ to 5m+. However, core currently maxes out at 1+ million.

We should change that for consistency.

We should also ensure that the string used here supports 10m+ in the future.

[dd32]

Example of a plugin with >1m installs: ​https://wordpress.org/plugins/akismet/

[dd32]

43193.diff​ implements this using _nx(), however I'm not sure if that's the best method in which to do it.

Do I pass 2,000,000 or 2 to the $number field for example? (I pass 2000000, and insert 2, which seems wrong)

[ocean90]

#43520 was marked as a duplicate.

[SergeyBiryukov]

Replying to dd32:

Do I pass 2,000,000 or 2 to the $number field for example? (I pass 2000000, and insert 2, which seems wrong)

$number should be the number displayed in the string, e.g. 2, 5, or 10.

[dd32]

In 42829:

Plugins: Add support for plugins having an active_installs value larger than 1 million.
WordPress.org currently supports up to 5 million, and with the growth of WordPress, it's expected that that upper bound will increase in the future.

Fixes #43193.

[johnbillion]

In [42829], the parameters passed to _nx() are in the wrong order.

[johnbillion]

In 43178:

Plugins: Correct the parameters used when displaying plugins with more than one million active installations.

Fixes #43193

[johnbillion]

In 43179:

Plugins: Correct another instance of incorrect parameter ordering when displaying plugins with more than one million active installations.

See #43193