Use when translating or localizing UI strings, marketing copy, documentation, or any source text into Serbian (sr / sr-Cyrl / sr-Latn). Asks the user to choose Cyrillic vs Latin on first use (both official, never mixed in one text). Enforces ekavian forms (vreme not vrijeme), 7-case grammar, 3-gender agreement, ICU one/few/other plurals, perfective/imperfective aspect, Vi/ti formality, clitic second-position, `da + present` construction, and Latin tech identifiers preserved inside Cyrillic.
