Align certified and translation labels

[dcellison]

Summary

• Align the certification badge with the neighbouring Translation label in text headers.
• Keep the existing type sizes, divider, icon, and link treatment unchanged.

Cause

The method row used baseline alignment. Since the badge begins with an SVG, the icon established the flex item's baseline and pulled both the check and Certified above Translation. Centre alignment puts the two labels back on the same visual line.

Checks

• python3 scripts/build_site.py
• git diff --cached --check