Localize trophy notifications with embedded JSON catalogs

src/common/localization.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#include <string_view>
+
+namespace Common::Localization {
+
+// Console language indices follow the system configuration; invalid indices use English.
+[[nodiscard]] std::string_view LocaleName(int console_language);
+
+// Translations have static lifetime. Missing translations use English, then the supplied key.
+[[nodiscard]] std::string_view Get(int console_language, std::string_view key);
+
+} // namespace Common::Localization