Use proper link concatenation

Signed-off-by: Danila Fedorin <danila.fedorin@gmail.com>

layouts/graph/single.html

@@ -1,7 +1,7 @@
 {{ define "main" }}
 <h2>{{ .Title }} </h2>
 <script src="{{ .Site.Params.visNetworkJsUrl }}"></script>
-<script type="module" src="{{ .Site.BaseURL }}/graph/graph.js"></script>
+<script type="module" src="{{ absLangURL "graph/graph.js" }}"></script>
 <style>
 #graph-container {
     width: 100%;