Hi,
1- Here first, you need to create a multilingual site like this one.
multilingual-joomla-demo.cloudaccess.net/
For example, you create two menu 'english' and 'french' for English and French languages.
2- Open default template style. Assign the current template style for English languuage.
3- Under Navigation Tab, chose 'english' as menu (megamenu)
4- Duplicate the template style
(click the down-arrow next to GREEN SAVE button and click SAVE AS COPY link) and assign to French. Under Navigation Tab, choose 'french' as the menu.
5- Now. Open Megamenu configuration page, config these menus ('english' and 'french')
6- Refresh in frontend.
7- You are all set.
There is a simpler method for multi-languages menu. Just create two menu, but name it in a simple format.
For ex: the menu for English name 'mymenu' and French should name to 'mymenu-fr'. StyleMart will detect and auto switch to 'mymenu-fr' if you view the website in French language. You do not have to create two template style and assign them to each menu.
FYI: StyleMart does not support multiple-language items in a single menu. We do not recommend this way though. Each Language must have different menus.
Question #2: You can't create another off-canvas on the left side. StyleMart designed and developed to support only 1 off-canvas, which sits on the right side of the website.
Regards