Support form "help" option inside translations

Author: Haehnchen

src/main/java/fr/adrienbrault/idea/symfony2plugin/form/FormTypeReferenceContributor.java

@@ -84,7 +84,7 @@ public PsiReference[] getReferencesByElement(@NotNull PsiElement psiElement, @No
                         String keyString = key.getContents();
 
                         // @TODO: how to handle custom bundle fields like help_block
-                        if(keyString.equals("label") || keyString.equals("help_block") || keyString.equals("help_inline") || keyString.equals("placeholder")) {
+                        if(keyString.equals("label") || keyString.equals("help_block") || keyString.equals("help_inline") || keyString.equals("placeholder") || keyString.equals("help")) {
                             // translation_domain in current array block
 
                             String translationDomain = FormOptionsUtil.getTranslationFromScope(arrayCreation);