Fix localized field hidden despite nonempty subkeys (Closes#10323)

modules/ui/field.js

@@ -97,6 +97,15 @@ export function uiField(context, presetField, entityIDs, options) {
                 }
                 return false;
             }
+            if (field.type === 'localized') {
+                for (let tagKey in _tags) {
+                    // matches for field:<code>, where <code> is a BCP 47 locale code
+                    let match = tagKey.match(/^(.*):([a-z]{2,3}(?:-[A-Z][a-z]{3})?(?:-[A-Z]{2})?)$/);
+                    if (match && match[1] === field.key && match[2]) {
+                        return true;
+                    }
+                }
+            }
             return _tags[key] !== undefined;
         });
     }