fix: complete i18n configuration and translations

Normalize locale detection, sync document language direction, complete locale keys, and add i18n regression coverage.

Refs rustfs/rustfs#2735

tests/lib/i18n-config.test.js

@@ -0,0 +1,27 @@
+import test from "node:test"
+import assert from "node:assert/strict"
+
+import { DEFAULT_LOCALE, getLocaleFile, isRtlLocale, normalizeLocale } from "../../lib/i18n-config.js"
+
+test("normalizeLocale accepts supported, browser, and legacy locale values", () => {
+  assert.equal(DEFAULT_LOCALE, "en")
+  assert.equal(normalizeLocale("en-US"), "en")
+  assert.equal(normalizeLocale("zh_CN"), "zh")
+  assert.equal(normalizeLocale("zhCN"), "zh")
+  assert.equal(normalizeLocale("pt-BR"), "pt")
+  assert.equal(normalizeLocale("pt_BR"), "pt")
+  assert.equal(normalizeLocale("ar-MA"), "ar")
+  assert.equal(normalizeLocale("unknown"), "en")
+})
+
+test("getLocaleFile resolves normalized locales to bundled locale files", () => {
+  assert.equal(getLocaleFile("en-US"), "en-US")
+  assert.equal(getLocaleFile("zh_CN"), "zh-CN")
+  assert.equal(getLocaleFile("pt-BR"), "pt-BR")
+})
+
+test("isRtlLocale detects right-to-left languages after normalization", () => {
+  assert.equal(isRtlLocale("ar-MA"), true)
+  assert.equal(isRtlLocale("ar"), true)
+  assert.equal(isRtlLocale("en-US"), false)
+})

tests/lib/i18n-locales.test.js

@@ -0,0 +1,88 @@
+import test from "node:test"
+import assert from "node:assert/strict"
+import fs from "node:fs"
+import path from "node:path"
+
+const localeDir = path.resolve("i18n/locales")
+const sourceRoots = ["app", "components", "contexts", "hooks", "lib", "config"]
+const sourceExtensions = new Set([".ts", ".tsx", ".js", ".jsx"])
+
+function readLocale(file) {
+  return JSON.parse(fs.readFileSync(path.join(localeDir, file), "utf8"))
+}
+
+function walkSourceFiles(dir, files = []) {
+  if (!fs.existsSync(dir)) return files
+
+  for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
+    const filePath = path.join(dir, entry.name)
+    if (entry.isDirectory()) {
+      if (entry.name !== "node_modules") walkSourceFiles(filePath, files)
+      continue
+    }
+
+    if (sourceExtensions.has(path.extname(entry.name))) files.push(filePath)
+  }
+
+  return files
+}
+
+function extractLiteralTranslationKeys(source) {
+  const keys = new Set()
+  const translationCall = /\bt\(\s*(["'`])((?:\\.|(?!\1)[\s\S])*?)\1/g
+  let match
+
+  while ((match = translationCall.exec(source))) {
+    if (!match[2].includes("${")) {
+      keys.add(match[2].replace(/\\'/g, "'").replace(/\\"/g, '"'))
+    }
+  }
+
+  return keys
+}
+
+function extractPlaceholders(value) {
+  return [...value.matchAll(/\{[^{}]+\}/g)].map(([placeholder]) => placeholder).sort()
+}
+
+test("all locale files provide the same keys as en-US", () => {
+  const referenceKeys = Object.keys(readLocale("en-US.json")).sort()
+  const localeFiles = fs
+    .readdirSync(localeDir)
+    .filter((file) => file.endsWith(".json"))
+    .sort()
+
+  for (const file of localeFiles) {
+    assert.deepEqual(Object.keys(readLocale(file)).sort(), referenceKeys, file)
+  }
+})
+
+test("en-US contains every literal translation key used by the app", () => {
+  const enUS = readLocale("en-US.json")
+  const usedKeys = new Set()
+
+  for (const file of sourceRoots.flatMap((root) => walkSourceFiles(root))) {
+    for (const key of extractLiteralTranslationKeys(fs.readFileSync(file, "utf8"))) {
+      usedKeys.add(key)
+    }
+  }
+
+  const missing = [...usedKeys].filter((key) => !(key in enUS)).sort()
+  assert.deepEqual(missing, [])
+})
+
+test("translated locale values preserve interpolation placeholders", () => {
+  const enUS = readLocale("en-US.json")
+  const localeFiles = fs
+    .readdirSync(localeDir)
+    .filter((file) => file.endsWith(".json") && file !== "en-US.json")
+    .sort()
+
+  for (const file of localeFiles) {
+    const locale = readLocale(file)
+
+    for (const [key, value] of Object.entries(enUS)) {
+      assert.deepEqual(extractPlaceholders(locale[key]), extractPlaceholders(value), `${file}: ${key}`)
+    }
+  }
+})