<DA-389> store challenges after search list downloaded
<DA-389> trigger download mediafiles and markup
Merge branch 'unstable' into DA-389

* unstable:
  <DA-390> update translations
  use software rendering in web view; fix CSS font definitions.
  show 1st tab in profile fragment if User item was selected
  fix menu definitions for the AppCompat ActionBar; modify ABTabListener (create new FragmentTransaction instead of using passed one) - this fixes issues with invisible added fragments. from now, the app should be usable again.
  automatically choose target version
  changed startup project
  fix some issues in action bar styles; some fragments were subclassed from wrong Fragment version
  -1 junk line in project file
  Update ZXing version for both platforms
  Use Action Bar from AppCompat
  Revert "Bindings done the hard way (but this gives no success)"
  Bindings done the hard way (but this gives no success)
<DA-389> adapt Android UI to the changes;
remove unused field in SearchResultController (fail callback)
<DA-394> show dialog only after OnResumeFragments()
<DA-389> always hide download/start button when displaying download progress
<DA-394> move common logic for “show dialog only after OnResumeFragments()” to base class, and apply light theme to all activities
<DA-394> move common logic for “show dialog only after OnResumeFragments()” to base class, and apply light theme to all activities (forgot to commit one change)
Merge branch 'DA-389' into DA-394

* DA-389:
  <DA-389> always hide download/start button when displaying download progress
Merge branch 'DA-394' into unstable

* DA-394:
  <DA-394> move common logic for “show dialog only after OnResumeFragments()” to base class, and apply light theme to all activities (forgot to commit one change)
  <DA-394> move common logic for “show dialog only after OnResumeFragments()” to base class, and apply light theme to all activities
  <DA-389> always hide download/start button when displaying download progress
  <DA-394> show dialog only after OnResumeFragments()
  <DA-389> adapt Android UI to the changes; remove unused field in SearchResultController (fail callback)
  <DA-389> trigger download mediafiles and markup
  <DA-389> store challenges after search list downloaded