[5.1] Update Jooa11y with latest Sa11y build (Attempt #2)

[adamchaboryk]

Continuation of #42768 based on @Fedik's review and feedback. Includes updated screenshots of changes.

(Sorry for re-creating the PR. Had issues re-basing from 5.0 to 5.1. After I renamed the branch on my fork, I inadvertently closed my PR.)

Summary of Changes

This PR adds Sa11y as a dependency, ensuring seamless and automatic updates for future Joomla releases.

• Sa11y is added as a dependency via build/build-modules-js/settings.json.
• Addition of several new languages.
  • New languages would be added by modifying build/build-modules-js/settings.json.
  • Automatic language detection based on page language.
  • Note: Only the admin settings will utilize Joomla's PLG language system.
• New configuration/properties in admin settings to customize experience for content editors.

Related issue: joomla-projects/joomla-a11y-checker#75

Testing Instructions

• Ensure you have a fresh JS build via npm install
• Navigate to "Accessibility Check" as you would normally. Accessibility Checker should appear in same spot.
• Add a language pack (like German for example), and ensure Accessibility Checker displays correct translation.

Actual result BEFORE applying this Pull Request

https://joomla-projects.github.io/joomla-a11y-checker/pages/errors.html

Expected result AFTER applying this Pull Request

Accessibility Check preview

Plugin settings with descriptions

Includes a couple of Extra Props for demonstration purposes. Extra props can accept boolean/numeric/string based on Sa11y's documentation.

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org: I'll do a PR later to update this page https://manual.joomla.org/docs/accessibility/testing

• No documentation changes for manual.joomla.org needed

[Fedik]

Thanks!
Only thing is left is to fix code style :)
https://ci.joomla.org/joomla/joomla-cms/73378/1/7
It looks like you mixed something with an indents

[brianteeman]

That is not my understanding of the help text which is in two parts

Always check for Form Labels, Contrast, Links (Advanced) by default.

implies these three checks will always take place

Enabling this option will visually hide the toggle switches in the Settings panel.

implies that the settings are not exposed to the user.

From my understanding of the behaviour that takes place then the help text should be

Enabling this option will visually hide the toggle switches for Form Labels, Contrast, Links (Advanced) in the Settings panel.

[adamchaboryk]

Enabling this option will visually hide the toggle switches for Form Labels, Contrast, Links (Advanced) in the Settings panel.

Works for me, makes more sense.

[brianteeman]

A release lead needs to decide if it is ok to delete all these unused strings r if we must follow previous policy that they should be deprecated instead

[Fedik]

@adamchaboryk I made another PR for string deprecation adamchaboryk#3
Unfortunatley we cannot just delete them

[brianteeman]

will give it a more detailed test tomottow but it looks good to me

[brianteeman]

I have tested this item ✅ successfully on 9144751

Thanks Adam

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[Fedik]

r2c

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[LadySolveig]

Added the language strings deprecation also to to the migration section in the documentation

joomla/Manual#223

[brianteeman]

great -= thanks all

[LadySolveig]

Thank you so much @adamchaboryk for your work and for taking care on the implementation into Joomla and this very nice new features 🚀
I really enjoyed seeing this great collaboration - thanks to everyone for being involved @Fedik @brianteeman @Quy @dgrammatiko

[adamchaboryk]

Thank you, Martina! I'm super excited for 5.1! I'm also very grateful for all the support and guidance from everyone. Looking forward to future collaborations!