Lets you configure languages in a list and define a shortcut to quickly cycle the vim spell checking function through those languages.
Some configuration options can be set in your ~/.vimrc.
let g:cycle_spell_check_modes = ["en_en", "de_de"]
let g:cycle_spell_check_indicator = 0
The option g:cycle_spell_check_modes sets the list of language enabled for cycling though, the initial value is ["en_en"].
The option g:cycle_spell_check_indicator sets the langugae used at startup, the initial value is len(g:cycle_spell_check_modes), which disables spell checking.