Changing the interface language

[Ubuntu-2020]

Suggestion.
Please add an item to Kiwix (.appimg) to change the interface language.
You can add the item for changing the interface language to the drop down list by clicking the button with three dots:

This way the user can choose the interface language from all available languages:

PS: please tell on which page the Kiwix interface is translated?

[kelson42]

This is a duplicate of #478. Everyboday can translate Kiwix' softwares on https://translate.kiwix.org