Add support for Github Issue Webhooks

app/Locales/pl_PL/translations.php

@@ -505,4 +505,15 @@ return array(
     // 'New password for the user "%s"' => '',
     // 'Choose an event' => '',
     // 'Github commit received' => '',
+    // 'Github issue opened' => '',
+    // 'Github issue closed' => '',
+    // 'Github issue reopened' => '',
+    // 'Github issue assignee change' => '',
+    // 'Github issue label change' => '',
+    // 'Create a task from an external provider' => '',
+    // 'Change the assignee based on an external username' => '',
+    // 'Change the category based on an external label' => '',
+    // 'Reference' => '',
+    // 'Reference: %s' => '',
+    // 'Label' => '',
 );