V8: Accessibility improvements for page name entry

[RachBreeze]

This PR is a resubmission of #5585

It aims to fix 43, 69, 75, 81 from the from the A & AA accessibility issue list #5277

Creating a content item
When creating a new content type there is screen reader only text which says:
"Create" + content type name

The concept is that it wkors as per Microsoft Teams, here when a user creates a folder they see:

Editing a content item
When editing an existing content item there is screen reader only text which says
"Edit" + content name

Name label
The "name" text box also now now has a hidden label which is "content type name" + Name

Placeholder
The placeholder in the name textbox remains the same as prior to this change, as placeholder text provides guidance for many users, placeholder text is not a replacement for labels.

Language amends
The language files now have accessibility specific place holders these have been added to en.xml and en_us.xml only

[emmaburstow]

Hi Rachel,

Thanks ever so much for the work. We'll take a look and let you know if we need anything from you.

Emma

[nul800sebastiaan]

Hey @RachBreeze! Thanks very much for the help here, I'll test it soon.

Just as a heads up: I have reverted most of your changes in the language files since it was impossible to figure out what actually changed. In the future, try to see in your git client, before you commit changes if all the whitespace has changed. It would be good to only commit the few lines that have actually changed so that the diff is readable. 👍

[nul800sebastiaan]

Works great! 🔉 "Edit Home" and 🔉 "Create ContentPage" - cool stuff!

Thanks very much @RachBreeze - well done! 👍👍

[nul800sebastiaan]

Cherry picked into 8.1.3 (9cab789)