feat(locales): add Dutch [nl-NL] locale (#738)

Author: DanielleHuisman

src/locales/nl-NL.json

@@ -0,0 +1,30 @@
+{
+  "todayButton": "Vandaag",
+  "nextMonth": "Volgende maand",
+  "previousMonth": "Vorige maand",
+  "nextYear": "Volgend jaar",
+  "previousYear": "Vorig jaar",
+  "weekdays": [
+    "zondag",
+    "maandag",
+    "dinsdag",
+    "woensdag",
+    "donderdag",
+    "vrijdag",
+    "zaterdag"
+  ],
+  "months": [
+    "januari",
+    "februari",
+    "maart",
+    "april",
+    "mei",
+    "juni",
+    "juli",
+    "augustus",
+    "september",
+    "oktober",
+    "november",
+    "december"
+  ]
+}

src/types/index.ts

@@ -30,6 +30,7 @@ export type LocaleOptions =
   | 'ja-JP'
   | 'ko-KR'
   | 'nb-NO'
+  | 'nl-NL'
   | 'nn-NO'
   | 'pl-PL'
   | 'pt-BR'

stories/data.ts

@@ -19,6 +19,7 @@ const locale = <const>[
   'ja-JP',
   'ko-KR',
   'nb-NO',
+  'nl-NL',
   'nn-NO',
   'pl-PL',
   'pt-BR',