Incorrect use of _n_noop() on the About page

[johnbillion]

_n() and _n_noop() are used to provide the singular and plural form of the same string. They should not be used when the singular string and the plural string are effectively different strings. Sergey explains it well here.

On wp-admin/about.php, _n_noop() is used incorrectly as it's providing strings which differ depending on whether the number is singular or plural.

_n_noop( 'Maintenance Release', 'Maintenance Releases' );
_n_noop( 'Security Release', 'Security Releases' );
_n_noop( 'Maintenance and Security Release', 'Maintenance and Security Releases' );

These need to be separated into six separate strings using __().

/* translators: 1: WordPress version number. */
_n_noop( '<strong>Version %1$s</strong> addressed a security issue.',
         '<strong>Version %1$s</strong> addressed some security issues.' );

This string needs to be altered so a and some are replaced with a number placeholder.

In addition, the logic used in about.php in minor releases needs to be corrected so these strings are selected based on whether there is, for example, one maintenance release or multiple maintenance releases in the branch, rather than using _n().

Previously: #28502, #33239

[johnbillion]

Milestoning for 4.3.2 as this bug only affects minor releases.

[dd32]

Bumping to 4.4 because we don't need to alter strings in a point release.

[SergeyBiryukov]

34307.patch​ decouples the strings. We should be careful to no longer use _n() for them in minor releases from now on.

I didn't touch them while working on #28502, because we know we're dealing with values less than 21 here, so this wasn't a problem for Slavic languages, but I agree we should be consistent with this.

[ocean90]

I don't think we have to announce the number of security issues on the about page. It would be incosistent with <strong>Version %1$s</strong> addressed some security issues and fixed %2$s bug. anyway.

[ocean90]

In 35611:

About: Don't use _n_noop() for singular/plural strings which provide no placeholder for a number.

This allows for using proper plural forms in languages with more than two forms.

Props SergeyBiryukov.
Fixes #34307.
See #28502.