[l10n] Add Norwegian Nynorsk (nn-NO) locale (mui#13946)

docs/data/date-pickers/localization/data.json

@@ -167,6 +167,14 @@
     "totalKeysCount": 50,
     "githubLink": "https://github.com/mui/mui-x/blob/master/packages/x-date-pickers/src/locales/nbNO.ts"
   },
+  {
+    "languageTag": "nn-NO",
+    "importName": "nnNO",
+    "localeName": "Norwegian (Nynorsk)",
+    "missingKeysCount": 0,
+    "totalKeysCount": 50,
+    "githubLink": "https://github.com/mui/mui-x/blob/master/packages/x-date-pickers/src/locales/nnNO.ts"
+  },
   {
     "languageTag": "fa-IR",
     "importName": "faIR",

packages/x-date-pickers/src/locales/index.ts

@@ -20,6 +20,7 @@ export * from './kzKZ';
 export * from './mk';
 export * from './nbNO';
 export * from './nlNL';
+export * from './nnNO';
 export * from './plPL';
 export * from './ptBR';
 export * from './roRO';

packages/x-date-pickers/src/locales/nnNO.ts

@@ -0,0 +1,100 @@
+import { PickersLocaleText } from './utils/pickersLocaleTextApi';
+import { getPickersLocalization } from './utils/getPickersLocalization';
+import { TimeViewWithMeridiem } from '../internals/models';
+
+const timeViews: Record<TimeViewWithMeridiem, string> = {
+  hours: 'timar',
+  minutes: 'minuttar',
+  seconds: 'sekundar',
+  meridiem: 'meridiem',
+};
+
+const nnNOPickers: Partial<PickersLocaleText<any>> = {
+  // Calendar navigation
+  previousMonth: 'Forrige månad',
+  nextMonth: 'Neste månad',
+
+  // View navigation
+  openPreviousView: 'Opne forrige visning',
+  openNextView: 'Opne neste visning',
+  calendarViewSwitchingButtonAriaLabel: (view) =>
+    view === 'year'
+      ? 'årsvisning er open, byt til kalendervisning'
+      : 'kalendervisning er open, byt til årsvisning',
+
+  // DateRange labels
+  start: 'Start',
+  end: 'Slutt',
+  startDate: 'Startdato',
+  startTime: 'Starttid',
+  endDate: 'Sluttdato',
+  endTime: 'Slutttid',
+
+  // Action bar
+  cancelButtonLabel: 'Avbryt',
+  clearButtonLabel: 'Fjern',
+  okButtonLabel: 'OK',
+  todayButtonLabel: 'I dag',
+
+  // Toolbar titles
+  datePickerToolbarTitle: 'Vel dato',
+  dateTimePickerToolbarTitle: 'Vel dato & klokkeslett',
+  timePickerToolbarTitle: 'Vel klokkeslett',
+  dateRangePickerToolbarTitle: 'Vel datoperiode',
+
+  // Clock labels
+  clockLabelText: (view, time, adapter) =>
+    `Vel ${timeViews[view]}. ${time === null ? 'Ingen tid vald' : `Vald tid er ${adapter.format(time, 'fullTime')}`}`,
+  hoursClockNumberText: (hours) => `${hours} timar`,
+  minutesClockNumberText: (minutes) => `${minutes} minuttar`,
+  secondsClockNumberText: (seconds) => `${seconds} sekundar`,
+
+  // Digital clock labels
+  selectViewText: (view) => `Vel ${timeViews[view]}`,
+
+  // Calendar labels
+  calendarWeekNumberHeaderLabel: 'Vekenummer',
+  calendarWeekNumberHeaderText: '#',
+  calendarWeekNumberAriaLabelText: (weekNumber) => `Veke ${weekNumber}`,
+  calendarWeekNumberText: (weekNumber) => `${weekNumber}`,
+
+  // Open picker labels
+  openDatePickerDialogue: (value, utils) =>
+    value !== null && utils.isValid(value)
+      ? `Vel dato, vald dato er ${utils.format(value, 'fullDate')}`
+      : 'Vel dato',
+  openTimePickerDialogue: (value, utils) =>
+    value !== null && utils.isValid(value)
+      ? `Vel tid, vald tid er ${utils.format(value, 'fullTime')}`
+      : 'Vel tid',
+  fieldClearLabel: 'Fjern verdi',
+
+  // Table labels
+  timeTableLabel: 'vel tid',
+  dateTableLabel: 'vel dato',
+
+  // Field section placeholders
+  fieldYearPlaceholder: (params) => 'Å'.repeat(params.digitAmount),
+  fieldMonthPlaceholder: (params) => (params.contentType === 'letter' ? 'MMMM' : 'MM'),
+  fieldDayPlaceholder: () => 'DD',
+  fieldWeekDayPlaceholder: (params) => (params.contentType === 'letter' ? 'EEEE' : 'EE'),
+  fieldHoursPlaceholder: () => 'tt',
+  fieldMinutesPlaceholder: () => 'mm',
+  fieldSecondsPlaceholder: () => 'ss',
+  fieldMeridiemPlaceholder: () => 'aa',
+
+  // View names
+  year: 'År',
+  month: 'Månad',
+  day: 'Dag',
+  weekDay: 'Vekedag',
+  hours: 'Timar',
+  minutes: 'Minuttar',
+  seconds: 'Sekundar',
+  meridiem: 'Meridiem',
+
+  // Common
+  empty: 'Tom',
+};
+
+export const nnNO = getPickersLocalization(nnNOPickers);