localization for ntfy and mail

frontend/src/utils/categories.ts

@@ -0,0 +1,45 @@
+import defaultCategories from "@shared/defaultCategories.json";
+
+type DefaultCategory = {
+  key: string;
+  de: string;
+  en: string;
+};
+
+const DEFAULT_CATEGORY_DATA = defaultCategories as DefaultCategory[];
+
+function normalize(input: string): string {
+  return input.trim().toLowerCase();
+}
+
+const translationsByNormalizedName = new Map<string, DefaultCategory>();
+for (const category of DEFAULT_CATEGORY_DATA) {
+  translationsByNormalizedName.set(normalize(category.de), category);
+  translationsByNormalizedName.set(normalize(category.en), category);
+}
+
+export function getCanonicalDefaultCategoryName(input: string): string | null {
+  const normalized = normalize(input);
+  const match = translationsByNormalizedName.get(normalized);
+  return match ? match.de : null;
+}
+
+export function translateCategoryName(name: string | null | undefined, language: string): string {
+  if (!name) {
+    return "";
+  }
+  const normalized = normalize(name);
+  const match = translationsByNormalizedName.get(normalized);
+  if (!match) {
+    return name;
+  }
+
+  if (language.startsWith("de")) {
+    return match.de;
+  }
+  if (language.startsWith("en")) {
+    return match.en;
+  }
+  // For other languages we fall back to English to keep labels readable.
+  return match.en;
+}