[T3CMS] Lower severity of unresolved routes

Author: cedricziel

typo3-cms/src/main/java/com/cedricziel/idea/typo3/annotation/RouteAnnotator.java

@@ -46,7 +46,7 @@ private void annotateRoute(@NotNull PsiElement psiElement, @NotNull AnnotationHo
             annotation.setTextAttributes(DefaultLanguageHighlighterColors.STRING);
         } else {
             TextRange range = new TextRange(psiElement.getTextRange().getStartOffset(), psiElement.getTextRange().getEndOffset());
-            annotationHolder.createErrorAnnotation(range, "Unresolved route");
+            annotationHolder.createWeakWarningAnnotation(range, "Unresolved route");
         }
     }
 }