Bugs

Tasks for Release 0.3

~~exclude Units without recordings~~
~~after downloading GHNS course, ask learner if it shall be added to favorite languages~~
~~set default qt-multimedia recording source (e.g. "alsa:default"), currently only updated once the config dialog was opened~~
~~due to gstreamer <-> pulseaudio deadlock problem, suggest using QTMULTIMEDIA~~
~~show graph when clicking "finish training"~~
~~user icon should be adjustable (male/female/arbitrary image)~~
course resources: update resources at GHNS

Handbook:
- document editor
- update handbook that currently no statistics are stored
~~count required learner recordings for statistics, instead of clicks on "Retry Later"~~
revisit interaction design
- training interactions
- ~~overview screen (previously called start/home screen)~~
use learner profiles
- ~~profile based "last learned language"~~
- save statistics
~~switch to QtGStreamer as main recording backend~~
provide at least two language courses
complete user documentation
- explain overview page
- ~~explain training page~~
- explain statistics page
use Leitner box learning for training
system wide course installation (aka class mode)
test with different color schemes
~~port to kqmlgraphplugin~~
- update to QtGStreamer 1.0 (once released)
- ~~upstream padding property for graphs~~
- upstream axis description property
minor UI todos
- training page
  - ~~add scrollbars for long texts (not fitting into bubble): https://git.reviewboard.kde.org/r/114627/~~
  - use font settings from configuration dialog
  - add background for progress bar phrase information
- overview page
  - give info if no course/units are available in language
handle corrupt course XML files gracefully in editor