Fixed
- When showing examples, show only one spelling alternative. Fixes [639](https://github.com/fniessink/toisto/issues/639).
- When quizzing colloquial language (which is quizzed spoken only), show the colloquial language after the quiz. Fixes [640](https://github.com/fniessink/toisto/issues/640).
- Split the "head" concept into two different concepts: head as in part of a human or animal body and head as in the main part of something. Fixes [643](https://github.com/fniessink/toisto/issues/643).
- When quizzing a colloquial sentence, mention that the user is expected to enter a complete sentence. Fixes [645](https://github.com/fniessink/toisto/issues/645).
- When quizzing a translation from source language to target language, show any examples in the target language. Fixes [649](https://github.com/fniessink/toisto/issues/649).