fix(mobile): Mark more strings for translation (#5132)

* fix(mobile): Mark more strings for translation

Moving more strings to the `i18n` JSON file, and also including their
es-US translations.

* Add more translatable strings

mobile/lib/modules/settings/ui/advanced_settings/advanced_settings.dart

@@ -68,11 +68,10 @@ class AdvancedSettings extends HookConsumerWidget {
         ),
         ListTile(
           dense: true,
-          title: Text(
-            // Not translated because the levels are only English
-            "Log level: $logLevel",
-            style: const TextStyle(fontWeight: FontWeight.bold),
-          ),
+          title: const Text(
+            "advanced_settings_log_level_title",
+            style: TextStyle(fontWeight: FontWeight.bold),
+          ).tr(args: [logLevel]),
           subtitle: Slider(
             value: levelId.value.toDouble(),
             onChanged: (double v) => levelId.value = v.toInt(),