fix several rendering issues in markdown (#3588)

- fix double escaping of html entities: " instead of "
- fix table is missing css class "table"
- fix quotes are not rendered

src/Utils/ParsedownExtension.php

@@ -18,7 +18,7 @@ class ParsedownExtension extends \Parsedown
 
     /**
      * Overwritten to prevent # to show up as headings for two reasons:
-     * - Hashes are often used to cross link issues in other systems
+     * - Hashes are often used to cross-link issues in other systems
      * - Headings should not occur in time record listings
      */
     protected $BlockTypes = [
@@ -146,4 +146,17 @@ class ParsedownExtension extends \Parsedown
 
         return $text;
     }
+
+    protected function blockTable($Line, array $Block = null)
+    {
+        $Block = parent::blockTable($Line, $Block);
+
+        if (\is_null($Block)) {
+            return;
+        }
+
+        $Block['element']['attributes']['class'] = 'table';
+
+        return $Block;
+    }
 }