🌍 i18n: Add multi-language support for Terms of Service and update modal content

client/src/terms/termsContent.ts

@@ -0,0 +1,45 @@
+import terms_en from './terms_en.md?raw';
+import terms_de from './terms_de.md?raw';
+import terms_fr from './terms_fr.md?raw';
+
+/**
+ * A mapping of language codes to their respective terms markdown content.
+ *
+ * You can add both base language codes (e.g. 'en') and full codes (e.g. 'pt-BR') if needed.
+ *
+ * @type {Record<string, string>}
+ */
+const markdownMap: Record<string, string> = {
+  en: terms_en,
+  de: terms_de,
+  fr: terms_fr,
+  // For example, to support Brazilian Portuguese, you could add:
+  // 'pt-BR': terms_ptBR,
+};
+
+/**
+ * Retrieves the terms markdown content for the specified language.
+ *
+ * The function first checks if an exact language code match exists in the markdown map.
+ * If not, it attempts to extract the base language (e.g., 'pt' from 'pt-BR') and checks again.
+ * If no match is found, it falls back to English.
+ *
+ * @param {string} lang - The language code, which may include a region (e.g., 'pt-BR', 'en-US').
+ * @returns {string} The markdown content corresponding to the language,
+ *                   or the English version if no matching language is found.
+ */
+export function getTermsMarkdown(lang: string): string {
+  // Check for exact language code match (e.g., 'pt-BR').
+  if (lang in markdownMap) {
+    return markdownMap[lang];
+  }
+
+  // Extract the base language (e.g., 'pt' from 'pt-BR') and check again.
+  const baseLang = lang.split('-')[0];
+  if (baseLang in markdownMap) {
+    return markdownMap[baseLang];
+  }
+
+  // Fall back to English if no match is found.
+  return markdownMap['en'];
+}