Remove unused hardcoded JA translation

[bbuilds]

Summary

Removed a hard-coded, non-translated/unused year string from the Japanese (JA) version of the site to allow for automatic year updates.

Context

The JA portion of the website was using a static string for the year, which required manual intervention to update annually. This created a discrepancy with the English site, which already handles the date dynamically.

Changes

• Removed the hard-coded year string from the JA localization.
• Verified that the JA site now inherits the dynamic date logic used across the rest of the platform.