This plugin allows you to toggle or cycle through some Vim configurations.
Plug 'asierrayk/vim-toggle'
noremap <F3> :call ToggleLocList()<CR>
noremap <F4> :call ToggleQuickfix()<CR>
let g:SpellLanglist= ["en_us", "es", "en_us,es"]
nnoremap <F6> :call ToggleCycleSpellLang()<CR>
nnoremap <F7> :call ToggleSpell()<CR>