Changed
- On the command line, accept concepts as positional arguments, so users don't have to type `--concept` or `-c` before each concept. Closes [631](https://github.com/fniessink/toisto/issues/631).
Added
- Show tip about the config file when users have not configured their language preferences. Closes [633](https://github.com/fniessink/toisto/issues/633).
- Add several concepts related to the human body.