1) You can create 1 custom tab that will be common for all the products – go to Theme Options > E-Commerce > Single Product page > Custom tab. Also, you can create individual custom tab – go to Products > edit product > http://prntscr.com/dpq48i
2) This type of slider displays products, please, make sure that you have products for the other languages. Also you can create different sliders for every language and edit home page for every language and choose appropriate slider.
