The 'Stable Version' button in Chinese version 4.x goes into an infinite loop

**Your Godot version:** 4.7

**Issue description:** In the Chinese version of the 'Unstable' warning, the 'Stable version' button still directs to the current page.

The Chinese version seems to not have a 'stable' version, only specific version numbers and 4.x (corresponding to latest).

**URL to the documentation page:** https://docs.godotengine.org/zh-cn/4.x/

Start at the reported Chinese documentation page, https://docs.godotengine.org/zh-cn/4.x/, and inspect the “Unstable” warning and its “Stable version” link target. Compare it with the corresponding stable-version navigation in another localization or version. Done means the Chinese button leaves the 4.x page and reaches the intended stable documentation instead of looping back.

Written by the indexing model from the issue text.