> See annotations last in the commented-out text/test area.
> I don't remove them, which should happen when spell is done,
> because they are inserted manually :)

> Other than that - works.

Not for me or I am missing somehting elementary.

I have 

Used your code but 

> (require 'cl-lib)
> (require 'ispell)

> (defvar ispell-langs '(("en" "american-insane")
>                        ("fr" "francais")
>                        ("sv" "svenska")))

But with 

(defvar ispell-langs '(("en" "american")
                       ("de" "odeutsch")))

american.aff -> english.aff
american.hash -> /var/lib/ispell/american.hash
deutsch.aff -> /usr/lib/ispell/odeutsch.aff
deutsch.hash -> /usr/lib/ispell/odeutsch.hash
odeutsch.aff -> ogerman.aff
odeutsch.hash -> ogerman.hash
ogerman.aff
ogerman.hash -> /var/lib/ispell/ogerman.hash

I tried the ispell-spell-all using

Damit sind die Voraussetzungen des lokalen Existenzsatzes für
Anfangsdaten $U(T)$ gegeben und man erhält die Existenz einer Lösung
auf dem Intervall $[T,T+\epsilon]$. 


Now let us look whether.


The german paragraph was checked using the american dictionary.

But I thought the language for each paragraph is automatically detected