Language and currency selector in popup (javascript code)

Add a side section that generates a language and currency picker popup.

The side section is found by editing, for example "Appearance > Top and bottom > Bottom bar (below)". By adding the side section here, it will be activated on all pages.

1. Click the blue button "Insert pre-filled section"
2. Select the category "Advanced"
3. Find the section and click "Add to my page"
4. Look in the section's code, and remember to adjust the available languages and currencies