tour: Dark mode resets when changing language selection

[jMautone]

Context

Go Tour - Language Selection Issue

Description

When selecting a language on step 2/5 of the Go Tour, the previously selected dark mode setting is lost. Additionally, the moon icon (used to toggle dark mode) disappears from the top-right corner. This forces the user to switch back manually, disrupting the experience.

Steps to Reproduce

1. Open the Go Tour.
2. Enable dark mode.
3. Navigate to step 2/5, where language selection is available.
4. Select any language.
5. Observe that:
   • Dark mode resets to light mode.
   • The moon icon disappears.

Expected Behavior

• The dark mode setting should remain enabled when changing the language.
• The moon icon should still be visible in the top-right corner.

Actual Behavior

• The dark mode resets to light mode.
• The moon icon disappears, preventing the user from switching back easily.

Additional Information

• OS: Windows 11
• Browser: Google Chrome Version 133.0.6943.127 (Build oficial) (64 bits)
• Screenshots: