update translations
include logfile instance in appinfo

storing the logfile instance as a variable in appinfo
prevents unnecessary duplication of data (e.g. logged
versionname and versioncode and information on last backup)
show app icons

add drawable with app icon to appinfo
set as public field because it doesn't need handling in the class
and it isn't always needed (remember to check for null)
Merge branch 'master' of https://github.com/jensstein/oandbackup