FIX: Prevent translation of hospital names and proper nouns in i18n mode (#3)

Language directives now explicitly instruct Claude to translate only its own
explanatory text and never modify hospital/facility names, drug names, sponsor
names, investigator names, trial titles, NCT IDs, or any proper nouns from
trial data. Unsure cases default to keeping the original English.

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

translations.py

@@ -62,21 +62,29 @@ UI: dict[str, dict[str, str]] = {
     },
 }
 
+_PRESERVE = (
+    "NEVER translate or modify: hospital/facility names, drug/treatment names, "
+    "sponsor names, principal investigator names, trial titles, NCT IDs, "
+    "medical abbreviations (ALSFRS-R, FVC, SOD1, etc.), gene names, or any "
+    "other proper nouns from the trial data. Keep all of these exactly as-is. "
+    "If you are unsure whether something is a proper noun, leave it in English."
+)
+
 LANGUAGE_DIRECTIVE: dict[str, str] = {
     "en": "",
     "zh": (
         "IMPORTANT: You must respond ONLY in Simplified Chinese (简体中文). "
-        "Every word you write to the patient must be in Chinese. "
-        "Standard medical abbreviations (ALSFRS-R, FVC, SOD1, etc.) may remain in their original form.\n\n"
+        "Translate only your own explanatory text — the words YOU write to the patient. "
+        f"{_PRESERVE}\n\n"
     ),
     "es": (
         "IMPORTANTE: Debes responder ÚNICAMENTE en español. "
-        "Cada palabra que escribas al paciente debe estar en español. "
-        "Las abreviaturas médicas estándar (ALSFRS-R, FVC, SOD1, etc.) pueden mantenerse en su forma original.\n\n"
+        "Traduce solo tu propio texto explicativo — las palabras que TÚ escribes al paciente. "
+        f"{_PRESERVE}\n\n"
     ),
     "hi": (
         "महत्वपूर्ण: आपको केवल हिन्दी में उत्तर देना है। "
-        "रोगी को लिखी गई हर बात हिन्दी में होनी चाहिए। "
-        "मानक चिकित्सा संक्षेप (ALSFRS-R, FVC, SOD1, आदि) अपने मूल रूप में रह सकते हैं।\n\n"
+        "केवल अपना स्वयं का व्याख्यात्मक पाठ अनुवाद करें — वे शब्द जो आप रोगी को लिखते हैं। "
+        f"{_PRESERVE}\n\n"
     ),
 }