Broken link and missing page

[chrisdel101]

The following links are broken _includes/header/header-id.html

• <a href="/{{ page.lang }}/changelog/4x.html">Release Change Log</a>

_includes/header/header-th.html

• <a href="/{{ page.lang }}/changelog/4x.html">บันทึกการเปลี่ยนแปลง</a>

Suggest change to: <a href="/en/changelog/">Release Change Log</a>

Missing page causes console error in UZ language: /css/langs/uz.css

Suggest adding this page.

[peterdanwan]

Hello @chrisdel101 may I try implementing these changes? I've added my PR and was wondering if I should also include css/id.css as well.