Update strings.xml

Add missing translations
Merge pull request #100 from jackuse/patch-1

Update strings.xml
Merge branch 'master' of https://github.com/uservoice/uservoice-android-sdk

# By jackuse
# Via Austin Taylor (1) and jackuse (1)
* 'master' of https://github.com/uservoice/uservoice-android-sdk:
  Update strings.xml