Adjust header menu layout for JP
What does this MR do and why?
Follow-up from !1660 (merged)
Adjusts header button layout for Japanese pages.
Why: If we're specifying a width in this region, we need to factor in what's inside. English pages include the Versions menu, and non-English pages do not.
Screenshots, screen recordings, or links to review app
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How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
- Configure a local GitLab Docs environment.
- Check out this branch.
- Visit the homepage and an interior page in both EN and JP. Header button layout should be consistent with regular spacing between items.
Merge request acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
- I have evaluated the MR acceptance checklist for this merge request.