The website works correctly... but not.

[JeanPaulLucien]

I found when the website works correctly. I have completed these steps:

1. go to https://whatcanidoformozilla.org
2. press "Back" button (it's visible but mustn't)

• "next" button is visible now

3. press "Next" button (blue button)
4. choose my language ru-RU

• get url view to https://whatcanidoformozilla.org/?lang=ru-RU#

5. press F5 (refresh the page)

• language resets by default
• get url view https://whatcanidoformozilla.org/?lang=ru-RU#!/progornoprog
• "Back" button isn't visible for main item, but visible for subitem. It works as needed.