Add language select to dotCMS backend

[swicken-dotcms]

Parent Issue

No response

User Story

As a SAML user, I want to be able to select what language my UI is in as the login selector is not available to me. This is not currently possible.

Acceptance Criteria

Add a language selector for the user to the dotCMS back end.

Proposed Objective

Core Features

External Links... Slack Conversations, Support Tickets, Figma Designs, etc.

https://dotcms.zendesk.com/agent/tickets/114782