Fixed unexpected fallback_locale behavior during direct locale updates.

Author: harshithad0703

lib/entity.js

@@ -155,7 +155,12 @@ export const update = (http, type, params = {}) => {
     delete json.deleted_at
     delete json.updated_at
     delete json.updated_by
-    delete json.updated_at
+    
+    // If param has data for this entity type, merge it with the json object
+    if (param && param[type]) {
+      Object.assign(json, param[type])
+    }
+    
     if (type) {
       updateData[type] = json
       if (type === 'entry') updateData[type] = cleanAssets(updateData[type])