Localize remaining hardcoded UI strings and persist language preference

Replaces the last hardcoded English strings (initial-scene modals, game
menu save status messages) with locale-loaded text, adds a shared
LOCALE_LIST so the settings dropdown and locale manager stay in sync,
and persists the chosen language into savemeta_t across all platforms.
Also fixes two message buffers that were too small for their longest
translations.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/dusklinux/save/savejsonlinux.c

@@ -31,6 +31,12 @@ void saveJsonWriterAddFloatLinux(
   yyjson_mut_obj_add_real(writer->doc, writer->root, key, (double)value);
 }
 
+void saveJsonWriterAddUInt8Linux(
+  savejsonwriterlinux_t *writer, const char_t *key, const uint8_t value
+) {
+  yyjson_mut_obj_add_uint(writer->doc, writer->root, key, (uint64_t)value);
+}
+
 void saveJsonWriterAddStringLinux(
   savejsonwriterlinux_t *writer, const char_t *key, const char_t *value
 ) {
@@ -122,6 +128,14 @@ float_t saveJsonReadFloatLinux(
   return (float_t)yyjson_get_num(val);
 }
 
+uint8_t saveJsonReadUInt8Linux(
+  yyjson_val *root, const char_t *key, const uint8_t defaultValue
+) {
+  yyjson_val *val = yyjson_obj_get(root, key);
+  if(!val || !yyjson_is_num(val)) return defaultValue;
+  return (uint8_t)yyjson_get_uint(val);
+}
+
 void saveJsonReadStringLinux(
   yyjson_val *root, const char_t *key, char_t *out, const size_t maxLen,
   const char_t *defaultValue

src/dusklinux/save/savejsonlinux.h

@@ -42,6 +42,13 @@ void saveJsonWriterAddFloatLinux(
   savejsonwriterlinux_t *writer, const char_t *key, const float_t value
 );
 
+/**
+ * Adds a "key": <uint> field to the root object.
+ */
+void saveJsonWriterAddUInt8Linux(
+  savejsonwriterlinux_t *writer, const char_t *key, const uint8_t value
+);
+
 /**
  * Adds a string field to the root object. The value is copied into the
  * document, so the caller's buffer doesn't need to outlive the call.
@@ -120,6 +127,14 @@ float_t saveJsonReadFloatLinux(
   yyjson_val *root, const char_t *key, const float_t defaultValue
 );
 
+/**
+ * Reads a uint8 field, falling back to defaultValue if the key is
+ * missing or not a number.
+ */
+uint8_t saveJsonReadUInt8Linux(
+  yyjson_val *root, const char_t *key, const uint8_t defaultValue
+);
+
 /**
  * Reads a string field into out, falling back to defaultValue if the key
  * is missing or not a string. Always null-terminates.

src/dusklinux/save/savelinux.c

@@ -120,6 +120,9 @@ errorret_t saveMetaLoadLinux(savemeta_t *out) {
   out->deadzone = saveJsonReadFloatLinux(
     root, "deadzone", SAVE_META_DEADZONE_DEFAULT
   );
+  out->language = saveJsonReadUInt8Linux(
+    root, "language", SAVE_META_LANGUAGE_DEFAULT
+  );
   out->exists = true;
 
   yyjson_doc_free(doc);
@@ -136,6 +139,7 @@ errorret_t saveMetaWriteLinux(savemeta_t *meta) {
   errorChain(saveJsonWriterInitLinux(&writer));
   saveJsonWriterAddUInt32Linux(&writer, "version", meta->version);
   saveJsonWriterAddFloatLinux(&writer, "deadzone", meta->deadzone);
+  saveJsonWriterAddUInt8Linux(&writer, "language", meta->language);
 
   errorret_t ret = saveJsonWriterSaveLinux(&writer, path);
   saveJsonWriterDisposeLinux(&writer);