[JENKINS-66746] Investigate an fr localization plugin creation

[timja]

Investigate the work required to move all fr localization to a dedicated plugin.

• plugin creation
• find maintainers
• move localization out of Jenkins Core (and plugins)
• add the plugin to the "suggested" one for "backward compatibility" (transparent for end users)

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Originally reported by ajard, imported from: Investigate an fr localization plugin creation

• status: Open
• priority: Minor
• resolution: Unresolved
• imported: 2022/01/10

[timja]

[Epic: JENKINS-66658]