Added some comments
Added exchangeRate to config and printing considering exchange rate
Possibility to change currency implemented
Fixed formatting when exchange rate != 1
Fixed issue with daily budget and different exchange rate
Added capitalization to first letter in EditTexts
Refactoring
Better looking layout in StatsActivity's ListView
Test this
Fixed formatting in StatsActivity
Started work on PreferenceActivity, no functionality yet
Added missing files
Moved category management to preferences
Removed add/remove category from main activity
Changed appearance of remove category fragment
Added BackupActivity
Writing to backup file possible
Started work on reading backup
Basic reading of backupfile
Fixed category removement bug