Merge pull request #18 from Felix2yu/master

Chinese translation
NPE fixed
fixed NumberFormatException when entering empty string
replaced 'yesterday' with 'average' and change all data on the screen
when switching from 'steps' to 'distance'
localization
Merge branch 'master' of git@github.com:j4velin/Pedometer.git
translated average to swedish
Merge pull request #19 from ogr3/master

translated average to swedish
Merge pull request #1 from j4velin/master

update