21187 add bilingual helper function

components/case/summary/utils/helpers.js

@@ -79,3 +79,17 @@ export function linkedCasesList(linkedCasesReference) {
         </>
     );
 }
+
+export const getBilingualText = (value, locale) => {
+    if (!value) return "";
+
+    // Prefer new delimiter if present
+    const delimiter = value.includes(">>>") ? ">>>" : ";";
+
+    // No delimiter at all → return whole string
+    if (!value.includes(delimiter)) return value;
+
+    const [en, cy] = value.split(delimiter);
+
+    return locale === "cy" ? (cy ?? en) : (en ?? cy);
+};