Reverse months order on Announcements sidebar

[Icaro-Nunes]

Reverse months order in Anouncements page, using new navigation.json

What problem is this solving?

#43

How should this be manually tested?

• Go to Announcements Page
• Expand Sidebar
• Click a Year
• See order of months

Screenshots or example usage

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Requires change to documentation, which has been updated accordingly.

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[github-actions]

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[brunoamui]

LGTM

[PedroAntunesCosta]

We had to make changes to the navigation JSON format to deal with localization. We are going to close this PR and address this in another one.