Update links to standards & update translations notes

[remibetin]

• Add link to WCAG 2.2 standard
• ARIA 1.2 instead of ARIA 1.1
• Change standards order : WCAG 2.2 > 2.1 > 2.0
• Update Translation Notes: when to link to a translated version and when to link to an original version.

🌐 Impact on translations:

• Recently Updated: French
• In-progress Updates: Indonesian
• Other outdated translations: Arabic, Chinese (Simplified), Czech, Korean, Russian, Spanish.

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[remibetin]

@shawna-slh Better to list WCAG standards in reverse order?

• WCAG 2.2
• WCAG 2.1
• WCAG 2.0

Instead of:

• WCAG 2.0
• WCAG 2.1
• WCAG 2.2

What do you think?

[remibetin]

@shawna-slh Ready to publish. See description for more context.

[shawna-slh]

@remibetin I also updated

[[WCAG 2.1 at a Glance]]

to

[[WCAG 2 at a Glance]]

[remibetin]

QA done: ✅