Update Metadate on J4 Landing page

[conconnl]

Actions to perform when translations are available.

Italian (it-IT) https://github.com/joomla/joomla.org/blob/master/www/4/language/overrides/it-IT.override.ini

Norwegian Bokmal (nb-NO) https://github.com/joomla/joomla.org/blob/master/www/4/language/overrides/nb-NO.override.ini

[karan-vaishnav]

Hello Sir, I'm Karan Vaishnav, a 2nd year engineering student and want to contribute here at Joomla. I'm familiar with HTML, CSS, JS and python. Since, I am very much interested in open source, I'm also looking forward to contribute in Google Summer of Code. Please take me on board for any of your upcoming or current projects that require frontend development skill.

[Ansh101112]

will submit pr asap.