Update strings.xml

Update Chinese translation
Updated Japanese Translation
Merge pull request #173 from bgcngm/master

Updated Portuguese (PT) translation
Merge pull request #174 from liveasx/patch-7

Update strings.xml
Merge pull request #175 from WedyDQ10/patch-5

Updated Japanese Translation
HW Key actions: don't eat up menu long-press when it's set to default.
Merge branch 'master' of https://github.com/C3C0/GravityBox.git
Make brightness limits config centralized and easy to manage
Plus changed minimum brightness limit from 10 to 5.
Updated Chinese (Traditional) translations (thanks to Eric850130)