fix(glossary): resolve data loss for non-FR/EN languages, fix prompt injection reference notes, and classic mode label wording

frontend/src/lib/i18n/messages/en/translate.json

@@ -18,7 +18,7 @@
   "translate.glossary.noGlossaryForPair": "No glossary for",
   "translate.glossary.noGlossaries": "No glossaries yet",
   "translate.glossary.loading": "Loading...",
-  "translate.glossary.classicMode": "Neutral engine without glossary (AI only)",
+  "translate.glossary.classicMode": "Classic engine (no glossary - Pro LLM mode required)",
   "translate.glossary.selectPlaceholder": "Select a glossary...",
   "translate.glossary.multilingual": "MULTILINGUAL",
   "translate.glossary.noGlossaryAvailable": "No glossary available",
@@ -38,7 +38,7 @@
   "translate.glossary.sourceTerm": "Source term",
   "translate.glossary.translation": "Translation",
   "translate.glossary.addTerm": "Add term",
-  "translate.glossary.disabledMode": "Neutral engine without glossary applied",
+  "translate.glossary.disabledMode": "Classic engine without glossary applied",
   "translate.glossary.addTermError": "Error adding term",
   "translate.glossary.networkError": "Network error",
   "translate.glossary.importFailed": "Import failed ({status})",