[App|Core] Accessibility audit conformances fixes

[NPavie]

Apply the conformance fix following the accessibility audit : IPIP_AccessibilityCompliancyTesting_rgaa4.1_auditFR.ods

[NPavie]

Corrections to apply for the sample P01

• [x] 6.1
• [x] 8.2
• [x] 8.6
• [x] 8.7
• [x] 9.2
• [ ] 10.7
• [x] 10.11
• [x] 11.1
• [x] 12.6
• [x] 12.7

Issues for this sample are common to most of the pages

[NPavie]

P01 - 10.11 The footer's logos has been made responsive using flexbox, but the issue remains with top bar not being responsive enough: The topbar tools should be converted as a collapsed menu. The navigation menu should also be reduced as either text or icon only button.

[NPavie]

P01 - 10.7 Top bar and footer buttons have been improved for the focus. The central buttons (for editors and connected users) remains to be improved

[NPavie]

Corrections to apply for the sample P02

• [x] 9.1
• [x] 9.2

On the 9.2 issue, i detected a wrongly defined content hierarchy in the page (a section holds a title with no content while another section holds the content without a title)

[NPavie]

Corrections to apply for the sample P03

• [x] 5.6

Note : it is a content related issue, as the column title needs to be set in the content/widget editor associated with it

[NPavie]

Corrections to apply for the sample P04

• [x] 1.2

[NPavie]

Corrections to apply for the sample P05

• [x] 5.6

[NPavie]

Corrections to apply for the sample P06

• [x] 9.1

[NPavie]

New request extracted from the user evaluation report:

• [ ] improve search bar accessibility by making the search bar with white background and black text