Add basic app interface

- Add pool struct for data pools

include/localization/localization.h

@@ -0,0 +1,28 @@
+#include "pch.h"
+#include "utils.h"
+
+namespace Localization {
+using Key = uint16_t;
+
+// Maps localization keys to their string identifiers. This is used for text elements to look up the correct localized string.
+extern std::unordered_map<std::string, Key> localization_key_map;
+
+using LanguageCode = uint32_t; // 32-bit integer to store the language code (e.g., "en", "fr", "es")
+
+extern LanguageCode current_language; // The currently active language code
+
+using JoinedKey = uint64_t; // 64-bit integer to store the joined language code and key
+
+inline JoinedKey join_keys(LanguageCode lang_code, Key loc_key) {
+  return (static_cast<JoinedKey>(lang_code) << 16) | loc_key;
+}
+
+extern std::unordered_map<JoinedKey, std::string> localized_strings;
+
+inline std::string get(Key key) {
+  auto it = localized_strings.find(join_keys(current_language, key));
+  if (it != localized_strings.end())
+    return it->second;
+  return "";
+}
+} // namespace Localization