It seems that in the JA stark quickstart we can't find the position Languageswitcherload when we create the module for the language switcher. I couldn't find it.
By default, the language switcher module of template is assigned to 'topbar' position.
If you want to assign to another position, you can simply create that position and assign module as you wish.
I had put the topbar position manually during the creation of the module of the switcher module.
tfourn Let me know if you need further help then.