Cannot select other languages from Arabic page

**Language selection overlay is outside the viewport.**

Step to reproduce:

1. Navigate to ar.Javascript.info
2. Click on Language selection icon on the right side of viewport
3. observe the overlay.


Start by opening ar.javascript.info and reproducing the language-selection overlay issue from the listed steps, then inspect the page elements and styles controlling the overlay position. Done means the language selector is fully visible and other languages can be selected from the Arabic page without leaving the viewport.

Written by the indexing model from the issue text.