HFP-3095 Add error message if unable to contact hub

Fix translation
Update hub registration ui

h5p.classes.php

@@ -3677,7 +3677,7 @@ class H5PCore {
       'helpChoosingLicense' => $this->h5pF->t('Help me choose a license'),
       'shareFailed' => $this->h5pF->t('Share failed.'),
       'editingFailed' => $this->h5pF->t('Editing failed.'),
-      'shareTryAgain' => $this->h5pF->t('Something went wrong, please try to share agian.'),
+      'shareTryAgain' => $this->h5pF->t('Something went wrong, please try to share again.'),
       'pleaseWait' => $this->h5pF->t('Please wait...'),
       'language' => $this->h5pF->t('Language'),
       'level' => $this->h5pF->t('Level'),
@@ -3774,6 +3774,10 @@ class H5PCore {
       throw new Exception($this->h5pF->t('Unable to authorize with the H5P Hub. Please check your Hub registration and connection.'));
     }
 
+    if (isset($response['status']) && $response['status'] !== 200) {
+      throw new Exception($this->h5pF->t('Connecting to the content hub failed, please try again later.'));
+    }
+
     $result = json_decode($response['data']);
     if (isset($result->success) && $result->success === TRUE) {
       return $result;