Update build.py

Dutch translation

build.py

@@ -33,6 +33,7 @@ langs = [
     {"name": "Polski", "ext": "pl"},
     {"name": "Português", "ext": "pt-br"},
     {"name": "Türkçe", "ext": "tr"},
+    {"name": "Nederlands", "ext": "nl"},
     {"name": "日本語", "ext": "jp"},
     {"name": "简体中文", "ext": "zh-cn"},
 ]
@@ -60,6 +61,17 @@ menu_translations = {
         "SOURCE": "Kaynak",
         "DONATE": "Destekle",
     },
+    "nl": {
+        "RETICULUM": "Reticulum",
+        "START": "Start",
+        "HARDWARE": "Hardware",
+        "TESTNET": "Testnet",
+        "MANUAL": "Handleiding",
+        "CRYPTO": "Crypto",
+        "CREDITS": "Dankwoord",
+        "SOURCE": "Broncode",
+        "DONATE": "Doeren",
+    },
     "jp": {
         "RETICULUM": "レチキュラム",
         "START": "開始",