remove checks for mbstring.func_overload

This ini setting no longer exists in PHP8, so we don't need to check
for it.

translation update

translation update

translation update

language updates for #3010 addition to #3981

jQuery and jQuery UI updates

translation update

translation update

translation update

translation update

translation update

translation update

translation update

translation update

update DokuWiki install URL

update smtp plugin URL

update flashplayer URL

translation update

translation update

translation update

translation update

translation update

translation update