Fixed typo that broke Summon facet translation; added config comments.

Thanks to Michael Wiesen for reporting the problem and fix.

config/vufind/Summon.ini

@@ -117,6 +117,13 @@ facet_limit        = 30     ; how many values should we show for each facet?
 ; control.
 special_facets      = daterange
 
+; Any facets named in the list below will have their values run through the 
+; translation code; unlisted facets will displayed as-is without translation.  For
+; translated facets, be sure that all of the necessary strings are included in the
+; language files found in the web/lang directory.  By default, no facets are 
+; translated -- uncomment or add lines below to turn on this feature.
+;translated_facets[] = ContentType
+
 ; This section shows which search types will display in the basic search box at
 ; the top of Summon pages.  The name of each setting below corresponds with an
 ; index defined in the Summon API.  The value of each setting is the text to 

module/VuFind/src/VuFind/Search/Summon/Options.php

@@ -69,7 +69,7 @@ class Options extends \VuFind\Search\Base\Options
         // Load facet preferences:
         $facetSettings = $this->getServiceLocator()->get('VuFind\Config')
             ->get($this->facetsIni);
-        if (isset($facetSettings->Advanced_Settings->translated_facets)
+        if (isset($facetSettings->Advanced_Facet_Settings->translated_facets)
             && count($facetSettings->Advanced_Facet_Settings->translated_facets) > 0
         ) {
             $list = $facetSettings->Advanced_Facet_Settings->translated_facets;