fix: Use LOG_ macros in loc functions (#1794)

## Summary

Quick follow up to #1408. We overlooked the fact that the change wasn't
using the LOG_ macros. Also, removed redundant file.close() calls, as in
23aad21.

---

### AI Usage

While CrossPoint doesn't have restrictions on AI tools in contributing,
please be transparent about their usage as it
helps set the right context for reviewers.

Did you use AI tools to help write this code? _**PARTIALLY**_

lib/I18n/I18n.cpp

@@ -1,7 +1,7 @@
 #include "I18n.h"
 
 #include <HalStorage.h>
-#include <HardwareSerial.h>
+#include <Logging.h>
 #include <Serialization.h>
 
 #include <string>
@@ -59,22 +59,22 @@ void I18n::saveSettings() {
 
   FsFile file;
   if (!Storage.openFileForWrite("I18N", SETTINGS_FILE, file)) {
-    Serial.printf("[I18N] Failed to save settings\n");
+    LOG_ERR("I18N", "Failed to save settings");
     return;
   }
 
   serialization::writePod(file, SETTINGS_VERSION);
-  serialization::writeString(file, getLanguageCode(_language));
 
-  file.close();
+  const char* code = getLanguageCode(_language);
-  Serial.printf("[I18N] Settings saved: language=%d code=%s\n", static_cast<int>(_language),
+  serialization::writeString(file, code);
-                getLanguageCode(_language));
+
+  LOG_DBG("I18N", "Settings saved: code=%s", code);
 }
 
 void I18n::loadSettings() {
   FsFile file;
   if (!Storage.openFileForRead("I18N", SETTINGS_FILE, file)) {
-    Serial.printf("[I18N] No settings file, using default (English)\n");
+    LOG_DBG("I18N", "No settings file, using default");
     return;
   }
 
@@ -84,45 +84,28 @@ void I18n::loadSettings() {
   if (version == SETTINGS_VERSION) {
     std::string code;
     serialization::readString(file, code);
-    bool found = false;
 
     for (uint8_t i = 0; i < getLanguageCount(); i++) {
       if (code == LANGUAGE_CODES[i]) {
         _language = static_cast<Language>(i);
-        found = true;
+        LOG_DBG("I18N", "Loaded language: %s", code.c_str());
-        break;
+        return;
       }
     }
 
-    if (found) {
+    LOG_ERR("I18N", "Unknown language code: %s", code.c_str());
-      Serial.printf("[I18N] Loaded language code: %s (%d)\n", code.c_str(), static_cast<int>(_language));
-    } else {
-      Serial.printf("[I18N] Unknown language code in settings: %s\n", code.c_str());
-    }
-    file.close();
     return;
   }
 
-  // Legacy migration path: version 1 stored language enum index directly.
   if (version == 1) {
     uint8_t lang;
     serialization::readPod(file, lang);
     if (lang < static_cast<size_t>(Language::_COUNT)) {
       _language = static_cast<Language>(lang);
-      Serial.printf("[I18N] Migrating v1 language index: %d -> %s\n", static_cast<int>(_language),
-                    getLanguageCode(_language));
-      file.close();
       saveSettings();
-      return;
+      LOG_INF("I18N", "Migrated v1 language setting");
     }
-    file.close();
-    Serial.printf("[I18N] Invalid v1 language index: %d\n", static_cast<int>(lang));
-    return;
   }
-
-  Serial.printf("[I18N] Settings version mismatch: %d\n", static_cast<int>(version));
-
-  file.close();
 }
 
 // Generate character set for a specific language