[i18n] Show full top-nav for all locales

[chalin]

• Waiting on [i18n] Support localization of page-not-translated banner #6339

Tasks

• es
• fr
• ja
• pt
• zh

[chalin]

@open-telemetry/docs-pt-approvers - I'd like to experiment with this feature implementation. Since you already have the Ecosystem section (and I think that the Status is coming too?), would you be open to me trying with the pt locale first?

[maryliag]

@chalin you can go ahead!