Add Dutch language (#473)

* Add Dutch language

* Sort language list alphabetically

Except English which stays on top

frontend/src/store/modules/language.js

@@ -9,14 +9,26 @@ const state = {
       name: "Dansk (Danish)",
       value: "da-DK",
     },
+    {
+      name: "Deutsch (German)",
+      value: "de-DE",
+    },
     {
       name: "Français (French)",
       value: "fr-FR",
     },
+    {
+      name: "Nederlands (Dutch)",
+      value: "nl-NL",
+    },
     {
       name: "Polski (Polish)",
       value: "pl-PL",
     },
+    {
+      name: "Português (Portuguese)",
+      value: "pt-PT",
+    },
     {
       name: "Svenska (Swedish)",
       value: "sv-SE",
@@ -29,14 +41,6 @@ const state = {
       name: "繁體中文 (Chinese traditional)",
       value: "zh-TW",
     },
-    {
-      name: "Deutsch (German)",
-      value: "de-DE",
-    },
-    {
-      name: "Português (Portuguese)",
-      value: "pt-PT",
-    },
   ],
 };