Translate Frontend Components and Helpers

(cherry picked from commit e777b7018481b18ef18f1116f75983a037bf0849)

Closes #8995

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

@@ -56,7 +56,7 @@ function KeyboardShortcutsModalContent(props) {
   return (
     <ModalContent onModalClose={onModalClose}>
       <ModalHeader>
-        Keyboard Shortcuts
+        {translate('KeyboardShortcuts')}
       </ModalHeader>
 
       <ModalBody>

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

@@ -92,7 +92,7 @@ class MovieSearchInput extends Component {
     if (item.type === ADD_NEW_TYPE) {
       return (
         <div className={styles.addNewMovieSuggestion}>
-          Search for {query}
+          {translate('SearchForQuery', { query })}
         </div>
       );
     }

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

@@ -79,7 +79,7 @@ class PageHeader extends Component {
           <IconButton
             className={styles.donate}
             name={icons.HEART}
-            aria-label="Donate"
+            aria-label={translate('Donate')}
             to="https://radarr.video/donate"
             size={14}
             title={translate('Donate')}

frontend/src/Components/Page/PageContentError.js

@@ -10,7 +10,7 @@ function PageContentError(props) {
       <PageContentBody>
         <ErrorBoundaryError
           {...props}
-          message={translate('ThereWasAnErrorLoadingThisPage')}
+          message={translate('ErrorLoadingPage')}
         />
       </PageContentBody>
     </div>