Admin: clarify the "Add New" links for better accessibility

[afercia]

In the admin menu and in some of the admin pages, various links use "Add New" as link text. While these links are clarified by the visual context, they are not so meaningful when read out of context.

Assistive technologies provide tools to list all the links in a page and dedicated keyboard shortcuts to navigate through links. In this scenario, a link that only says "Add New" isn't sufficiently clear: users won't have a clue what the purpose and destination of the link is.

One more scenario: users who use speech input software (e.g. Dragon) will voice a command like "Click add new". However, in a standard WordPress page there are at least 5 "Add New" links. The software will display choices to users (usually by displaying numbers close to all the links that it has identified as "Add New"). Then, users will have to:

• visually identify on the screen the highlighted links
• voice an additional command, e.g. "Choose 3"

This makes the process inefficient and time consuming.

Ideally, all these links should be self-explanatory and provide more context by adding the "what" new is in the text link. For example:

• Add New Post
• Add New Media
• Add New Page
• Add New Plugin
• Add New User

[afercia]

VoiceOver links list

[afercia]

In the screenshot above, the VoiceOver links list showing some of the "Add New" links.

As mentioned previously, this applies also to the "Add New" links within the various pages, e.g. in wp-admin/edit.php and also the ones on multisite.

Related: #47124 and #47012.

[afercia]

Discussed during today's accessibility bug scrub and agreed this is something that should be addressed, especially for speech recognition software users.

[gonzomir]

I've submitted a patch that updates all "Add New" links (that I could find in the source) together with "Add Existing" links for users and some comments, theme readmes that reference these links. I'm not sure though that my approach for the post types "Add New" menu items is the best one.