Dear Maintainer,

I gradually advanced to exercise with lesson 18 / all characters in a setup
with "USA | QWERTY | Windows" as keyboard layout, and "English | QWERTY" about
the language.  In contrast to the previous installments, the dictations now
use a mix of English and German (cf. the attached dictation copy-pasted from
the report window after one session below).

For now, I'm not sure if this affects the progress of the training, for
instance the use of square brackets and curly braces.  Based on my
recollection,
these characters were not considered by earlier lessons, nor were used in
training sessions of lesson 18.

```
Dictation
This is the last text lesson:
378 Seiten Manuskript.
Viel Zeit, viel Zeit, die besser verwendet werden koennte, kostet mich das
kleine Volk.
378 Seiten Manuskript.
They dance along with the meolody of the songs they sing.
3 plus 8 sind 11. Ganz klar!
He saw his son every year in London.
3 plus 8 sind 11. Ganz klar!
Ja, ich weiss.
3 plus 8 sind 11. Ganz klar!
Da lag Deutschland.
Marion wurde immer roeter.
378 Seiten Manuskript.
Meinst du das wi
```