to translate the menus :
you have to first translate the menu items in "Logged in menu " location in appearance=> menus .
after this please follow :
please follow these steps :
1 . Please go to wp-admin-> vibebp -> settings -> BuddyPress .
2 . Close all other tabs except wp-admin-> vibebp -> settings -> BuddyPress ..
3 . then switch to a different language -> this will set the language cookie correctly.
4 . Now then hit the Refresh BuddyPress navigation button.
5 . close the newly opened profile page.
6 . now switch to other language on the page wp-admin-> vibebp -> settings -> buddypress then follow same from 2 to 5 .
the issue with the course thumbnails on the page can be translated using wpml string translations .