Tsvetan Mikov restored the AndroidUnicodeUtils.java utility in the Hermes repository, re-enabling essential locale-aware operations such as string comparison, date and time formatting, case conversion, and Unicode normalization for Android. Working in Java, he focused on internationalization and Unicode handling, carefully reintegrating the deleted utility to stabilize cross-locale functionality without introducing regressions. His work addressed a critical gap in Hermes by ensuring reliable internationalization workflows and reducing locale-related defects. Through precise code recovery and maintenance, Tsvetan preserved key Unicode processing capabilities, supporting correct behavior across diverse locales and improving the reliability of date handling in Android applications.