v1.0 with SW PWA enabled

frontend/node_modules/date-fns/locale/cy/_lib/localize.mjs

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+import { buildLocalizeFn } from "../../_lib/buildLocalizeFn.mjs";
+
+const eraValues = {
+  narrow: ["C", "O"],
+  abbreviated: ["CC", "OC"],
+  wide: ["Cyn Crist", "Ar ôl Crist"],
+};
+
+const quarterValues = {
+  narrow: ["1", "2", "3", "4"],
+  abbreviated: ["Ch1", "Ch2", "Ch3", "Ch4"],
+  wide: ["Chwarter 1af", "2ail chwarter", "3ydd chwarter", "4ydd chwarter"],
+};
+
+// Note: in English, the names of days of the week and months are capitalized.
+// If you are making a new locale based on this one, check if the same is true for the language you're working on.
+// Generally, formatted dates should look like they are in the middle of a sentence,
+// e.g. in Spanish language the weekdays and months should be in the lowercase.
+const monthValues = {
+  narrow: ["I", "Ch", "Ma", "E", "Mi", "Me", "G", "A", "Md", "H", "T", "Rh"],
+
+  abbreviated: [
+    "Ion",
+    "Chwe",
+    "Maw",
+    "Ebr",
+    "Mai",
+    "Meh",
+    "Gor",
+    "Aws",
+    "Med",
+    "Hyd",
+    "Tach",
+    "Rhag",
+  ],
+
+  wide: [
+    "Ionawr",
+    "Chwefror",
+    "Mawrth",
+    "Ebrill",
+    "Mai",
+    "Mehefin",
+    "Gorffennaf",
+    "Awst",
+    "Medi",
+    "Hydref",
+    "Tachwedd",
+    "Rhagfyr",
+  ],
+};
+
+const dayValues = {
+  narrow: ["S", "Ll", "M", "M", "I", "G", "S"],
+  short: ["Su", "Ll", "Ma", "Me", "Ia", "Gw", "Sa"],
+  abbreviated: ["Sul", "Llun", "Maw", "Mer", "Iau", "Gwe", "Sad"],
+  wide: [
+    "dydd Sul",
+    "dydd Llun",
+    "dydd Mawrth",
+    "dydd Mercher",
+    "dydd Iau",
+    "dydd Gwener",
+    "dydd Sadwrn",
+  ],
+};
+
+const dayPeriodValues = {
+  narrow: {
+    am: "b",
+    pm: "h",
+    midnight: "hn",
+    noon: "hd",
+    morning: "bore",
+    afternoon: "prynhawn",
+    evening: "gyda'r nos",
+    night: "nos",
+  },
+  abbreviated: {
+    am: "yb",
+    pm: "yh",
+    midnight: "hanner nos",
+    noon: "hanner dydd",
+    morning: "bore",
+    afternoon: "prynhawn",
+    evening: "gyda'r nos",
+    night: "nos",
+  },
+  wide: {
+    am: "y.b.",
+    pm: "y.h.",
+    midnight: "hanner nos",
+    noon: "hanner dydd",
+    morning: "bore",
+    afternoon: "prynhawn",
+    evening: "gyda'r nos",
+    night: "nos",
+  },
+};
+
+const formattingDayPeriodValues = {
+  narrow: {
+    am: "b",
+    pm: "h",
+    midnight: "hn",
+    noon: "hd",
+    morning: "yn y bore",
+    afternoon: "yn y prynhawn",
+    evening: "gyda'r nos",
+    night: "yn y nos",
+  },
+  abbreviated: {
+    am: "yb",
+    pm: "yh",
+    midnight: "hanner nos",
+    noon: "hanner dydd",
+    morning: "yn y bore",
+    afternoon: "yn y prynhawn",
+    evening: "gyda'r nos",
+    night: "yn y nos",
+  },
+  wide: {
+    am: "y.b.",
+    pm: "y.h.",
+    midnight: "hanner nos",
+    noon: "hanner dydd",
+    morning: "yn y bore",
+    afternoon: "yn y prynhawn",
+    evening: "gyda'r nos",
+    night: "yn y nos",
+  },
+};
+
+const ordinalNumber = (dirtyNumber, _options) => {
+  const number = Number(dirtyNumber);
+
+  if (number < 20) {
+    switch (number) {
+      case 0:
+        return number + "fed";
+      case 1:
+        return number + "af";
+      case 2:
+        return number + "ail";
+      case 3:
+      case 4:
+        return number + "ydd";
+      case 5:
+      case 6:
+        return number + "ed";
+      case 7:
+      case 8:
+      case 9:
+      case 10:
+      case 12:
+      case 15:
+      case 18:
+        return number + "fed";
+      case 11:
+      case 13:
+      case 14:
+      case 16:
+      case 17:
+      case 19:
+        return number + "eg";
+    }
+  } else if ((number >= 50 && number <= 60) || number === 80 || number >= 100) {
+    return number + "fed";
+  }
+  return number + "ain";
+};
+
+export const localize = {
+  ordinalNumber,
+
+  era: buildLocalizeFn({
+    values: eraValues,
+    defaultWidth: "wide",
+  }),
+
+  quarter: buildLocalizeFn({
+    values: quarterValues,
+    defaultWidth: "wide",
+    argumentCallback: (quarter) => quarter - 1,
+  }),
+
+  month: buildLocalizeFn({
+    values: monthValues,
+    defaultWidth: "wide",
+  }),
+
+  day: buildLocalizeFn({
+    values: dayValues,
+    defaultWidth: "wide",
+  }),
+
+  dayPeriod: buildLocalizeFn({
+    values: dayPeriodValues,
+    defaultWidth: "wide",
+    formattingValues: formattingDayPeriodValues,
+    defaultFormattingWidth: "wide",
+  }),
+};