fix(ui): Fix crash when viewing an invalid certificate (#43681)

* fix: remove empty object literal creation causing #43224

* fix: initialize userByName selector using empty object from initialState to keep the same reference instead

* fix(lang): added translation for invalid certificate

client/src/redux/index.js

@@ -229,8 +229,9 @@ export const shouldRequestDonationSelector = state => {
 
 export const userByNameSelector = username => state => {
   const { user } = state[ns];
-  // TODO: Why return a string or empty objet literal?
-  return username in user ? user[username] : {};
+  // return initial state empty user empty object instead of empty
+  // object litteral to prevent components from re-rendering unnecessarily
+  return user[username] ?? initialState.user;
 };
 
 export const certificatesByNameSelector = username => state => {