[Navigation v2] Add a lang attribute on links to pages written in foreign language

[renow-luxembourg]

Feature Request

Current Behavior :
In the navigation component, the destination page of some links can be in different language (with a custom language defined in advanced properties)
Links to pages written in a foreign language are not well rendered to assistive tool (like the NVDA screen reader)

Expected behavior/code :
Each link in the navigation component should be vocalized in its appropriate language.

Environment

• AEM 6.5.19
• Core Components version 2.23.4 - Navigation component v2

Possible Solution :
Add a lang attribute on navigation link to a destination page with a content in another language.

Additional context :
WCAG 2.1 : 3.1.2 Language of Parts (https://www.w3.org/WAI/WCAG21/Understanding/language-of-parts)
WCAG 2.1 : Technique H58 (https://www.w3.org/WAI/WCAG21/Techniques/html/H58)
RGAA 4.1.2 / RAWeb 1 : 8.7.1 https://accessibilite.public.lu/fr/raweb1/criteres.html#test-8-7-1 (in french)