docs:update xpert translation docs

[nsprenkle]

Updates the Xpert Course Translations feature description page (feature_description.rst) with revised copy and new screenshots reflecting the current learner-facing UI.

Changes:

• Rewrote section 12.9.1 (Feature Description) with updated copy describing the XT feature from a learner perspective
• Added new screenshots: globe icon in the top bar, language selection modal, and translation reset icon
• Removed 6 outdated images that are no longer referenced

Date Needed (optional)

ASAP

Reviewers

Possible roles follow. The PR submitter checks the boxes after each reviewer finishes and gives 👍.

• Subject matter expert: @jristau1984

Testing

• Ran ./run_tests.sh without warnings or errors

[Copilot]

Pull request overview

This PR updates the Xpert Course Translations (XT) documentation in the Course Authors guide to reflect the current learner-facing UI, including new screenshots, and adds a CLAUDE.md file with repository workflow/build guidance.

Changes:

• Rewrites the XT Feature Description content to describe the learner experience (language selection + reset).
• Adds/updates screenshot assets referenced by the updated doc.
• Adds CLAUDE.md with common commands and repo/build notes for Claude Code.

Reviewed changes

Copilot reviewed 2 out of 11 changed files in this pull request and generated 2 comments.

File	Description
en_us/course_authors/source/course_features/xpert_translations/feature_description.rst	Updates XT feature description text and swaps screenshots to match current UI.
en_us/course_authors/source/images/xpert_translations_language_modal.png	Adds/updates the language-selection modal screenshot used in the XT docs.
CLAUDE.md	Documents repo build/test commands and high-level architecture notes for Claude Code usage.

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[Copilot]

Pull request overview

Copilot reviewed 4 out of 10 changed files in this pull request and generated 2 comments.

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[Copilot]

Pull request overview

Copilot reviewed 6 out of 12 changed files in this pull request and generated 2 comments.

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Pull request overview

Copilot reviewed 2 out of 9 changed files in this pull request and generated 1 comment.

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[jristau1984]

Thanks for this!