Opencart upgrade to 2.3 & Modify Journal theme header

First Milestone -Upgrade opencart core from 2.1 to 2.3 without losing current settings or data or extensions, i will give you access to the current code, when we tried upgrading we faced some erors ([login to view URL]) Second Milestone -I need to make some edits to the famous journal theme "1st skin" ( [login to view URL] ) and change the header to be like the screenshot by changing the location of some items & some colours as in the next screenshots as it is an rtl theme so you must take care of that english ( [login to view URL] ) arabic ( [login to view URL] ) Desktop/Laptop version: -The main menu is a horizontal menu and the first item of the horizontal menu is expanded by default so it appears as if it is vertical menu coming out of the horizontal one. -the header includes the horizontal menu (with verticl expansion) and it is fixed in all pages and dont move while scrolling while other data scrolls. in Mobile version: -the horizontal menu is expanded by default as the screenshot ( [login to view URL] ). -the menu should be collapsed in any other page rather than the home as category or product or ... etc -code should be clean and wsc validated -it should not override the opencart code but use the theme css panel or vqmod/ocmod for changes without playing in the core. -you should submit the changes to us by telling the files that had changes to test locally or by using [login to view URL]