Replace language name with a flag and add the language picker to all the pages

[doobneek1]

• Language picker on all pages. The language can be affected by VPN or browser settings or by the language of the Ad from which we go to the page (and this can mismatch the user's preference), additionally, if we share the link to a certain search result or to a specific location, a user, not knowing the navigation of the site would not figure they should go home to change language, plus it is not convenient to go home, change language, and then return to the page you were viewing.
• Language logo as opposed to verbose language name. Many languages have longer names and with narrow screen take too much space, a flag is more noticeable and will fit on all headers.