feat: i18n support for backend

Server/utils/formattedKey.js

@@ -0,0 +1,14 @@
+/**
+ * Converts a snake_case or SCREAMING_SNAKE_CASE key to camelCase
+ * Example: AUTH_INCORRECT_PASSWORD -> authIncorrectPassword
+ * @param {string} key - The key to format
+ * @returns {string} - The formatted key in camelCase
+ */
+export const formattedKey = (key) => {
+  return key.toLowerCase()
+    .split('_')
+    .map((word, index) =>
+      index === 0 ? word : word.charAt(0).toUpperCase() + word.slice(1)
+    )
+    .join('');
+};