Update strings.xml

Updated Chinese translation
Merge pull request #157 from liveasx/patch-5

Update strings.xml
update italian translation to 2.6.0

update italian translation to 2.6.0
Traffic monitor: allow translations of units
Updated French translation

Traffic monitor : translations of units
Ongoing notifications preference: show hint when list empty
Updated Chinese (Traditional) translations (thanks to Eric850130)
Fixed ongoing notification blocker for Android 4.3
Merge pull request #159 from ch-vox/patch-51

Updated French translation
Merge pull request #158 from pitone02/patch-10

update italian translation to 2.6.0
Expandable volume panel: show ringer slider only for devices with voice
feature
Plus alarm slider added.
Merge pull request #156 from bgcngm/master

Updated Portuguese (PT) translation
Updated German translations (thanks to samsonbear)
Volume panel: don't allow volume linking if device is not voice capable
ModPhode: make available only for voice capable devices
Updated Polish translations (thanks to xtrem007)
Updated Japanese Translation
WiFi tile: fixed SystemUI crash on some mt6589 devices with modified
signal cluster handling (e.g. ZTE N986)
Merge pull request #160 from WedyDQ10/patch-4

Updated Japanese Translation
Version 2.6.1