Fixed some aria violations

(cherry picked from commit 7aa846343815105e3576e6aa20eac64fcb0edf8d)

Closes #2422

frontend/src/Components/Page/Header/PageHeader.js

@@ -61,6 +61,7 @@ class PageHeader extends Component {
             <img
               className={styles.logo}
               src={`${window.Readarr.urlBase}/Content/Images/logo.svg`}
+              alt="Readarr Logo"
             />
           </Link>
         </div>
@@ -79,6 +80,7 @@ class PageHeader extends Component {
           <IconButton
             className={styles.donate}
             name={icons.HEART}
+            aria-label="Donate"
             to="https://opencollective.com/readarr"
             size={14}
           />

frontend/src/Components/Page/Header/PageHeaderActionsMenu.js

@@ -20,7 +20,7 @@ function PageHeaderActionsMenu(props) {
   return (
     <div>
       <Menu alignMenu={align.RIGHT}>
-        <MenuButton className={styles.menuButton}>
+        <MenuButton className={styles.menuButton} aria-label="Menu Button">
           <Icon
             name={icons.INTERACTIVE}
           />