Update to fix value compaction when there is a default language.

jsonld.php

@@ -1146,10 +1146,15 @@ class JsonLdProcessor {
     if(is_object($element)) {
       // element is a @value
       if(self::_isValue($element)) {
-        // if @value is the only key, return its value
+        // if @value is the only key
         if(count(get_object_vars($element)) === 1) {
+          // if there is no default language, return value of @value
+          if(!property_exists($ctx, '@language')) {
             return $element->{'@value'};
           }
+          // return full element
+          return $element;
+        }
 
         // get type and language context rules
         $type = self::getContextValue($ctx, $property, '@type');