Update config so an existing template is used
Twig Extension Bundle cleanup

- Now wants the Request object as an optional parameter, instead of retrieving that object from the DI Container.
Various improvements

- Simplifies controllers a bit
- Adds default ordering for phrases in chapter
- Makes remark columns nullable so they are no longer required
- Uses language names instead of abstract references when displaying the add phrase page
- Adds a font path to the scss variables so the links are created correctly
- Uses table layout for book list
- Lists chapters in book on detail page of book
- Lists phrases (without the remarks) on detail page of chapter
- Uses parent_template() function to determine parent template when adding phrases
- Adds some paths that contain generated files to .gitignore