v2.0: Full localization (6 languages), first-run language screen, aircraft detail overhaul, aircraft-model API fallback, and multiple bugfixes

src/language_screen.h

@@ -0,0 +1,7 @@
+#pragma once
+#include <Arduino.h>
+#include <TFT_eSPI.h>
+
+namespace LanguageScreen {
+    void run(TFT_eSPI& tft);
+}