[l10n] Improve Dutch (nl-NL) locale (#15920)

Signed-off-by: JoepVerkoelen <jverkoelen@gmail.com>
Co-authored-by: Joep Verkoelen <joep.verkoelen@infradaxoverheid.nl>

docs/data/data-grid/localization/data.json

@@ -75,7 +75,7 @@
     "languageTag": "nl-NL",
     "importName": "nlNL",
     "localeName": "Dutch",
-    "missingKeysCount": 5,
+    "missingKeysCount": 0,
     "totalKeysCount": 123,
     "githubLink": "https://github.com/mui/mui-x/blob/v7.x/packages/x-data-grid/src/locales/nlNL.ts"
   },

packages/x-data-grid/src/locales/nlNL.ts

@@ -43,7 +43,7 @@ const nlNLGrid: Partial<GridLocaleText> = {
   columnsManagementNoColumns: 'Geen kolommen',
   columnsManagementShowHideAllText: 'Toon/Verberg Alle',
   columnsManagementReset: 'Reset',
-  // columnsManagementDeleteIconLabel: 'Clear',
+  columnsManagementDeleteIconLabel: 'Verwijderen',
 
   // Filter panel text
   filterPanelAddFilter: 'Filter toevoegen',
@@ -59,9 +59,9 @@ const nlNLGrid: Partial<GridLocaleText> = {
 
   // Filter operators text
   filterOperatorContains: 'bevat',
-  // filterOperatorDoesNotContain: 'does not contain',
+  filterOperatorDoesNotContain: 'bevat niet',
   filterOperatorEquals: 'gelijk aan',
-  // filterOperatorDoesNotEqual: 'does not equal',
+  filterOperatorDoesNotEqual: 'niet gelijk aan',
   filterOperatorStartsWith: 'begint met',
   filterOperatorEndsWith: 'eindigt met',
   filterOperatorIs: 'is',
@@ -82,9 +82,9 @@ const nlNLGrid: Partial<GridLocaleText> = {
 
   // Header filter operators text
   headerFilterOperatorContains: 'Bevat',
-  // headerFilterOperatorDoesNotContain: 'Does not contain',
+  headerFilterOperatorDoesNotContain: 'Bevat niet',
   headerFilterOperatorEquals: 'Gelijk aan',
-  // headerFilterOperatorDoesNotEqual: 'Does not equal',
+  headerFilterOperatorDoesNotEqual: 'Niet gelijk aan',
   headerFilterOperatorStartsWith: 'Begint met',
   headerFilterOperatorEndsWith: 'Eindigt met',
   headerFilterOperatorIs: 'Is',