Remove arrays.xml from all languages.

For easier translation, only one `arrays.xml` file remains with the
strings in the array residing in `strings.xml`.

Removed landscape styles.
Removed unused arrays within the `arrays.xml` file.

Fixes #331 

[Testrun](http://catrobatgw.ist.tugraz.at:8080/job/Catroid-custom-branch-test/1045/#showFailuresLink).
`org.catrobat.catroid.uitest.content.brick.PointToBrickTest.testPointToBrickTest` also fails in the [`master` branch.](http://catrobatgw.ist.tugraz.at:8080/job/Catroid-single-UI-test/702/console)
`org.catrobat.catroid.uitest.web.ProjectUpAndDownloadTest#testTokenReplacementAfterUpload` works locally, but [fails on Jenkins](http://catrobatgw.ist.tugraz.at:8080/job/Catroid-single-UI-test/708/console).
`org.catrobat.catroid.uitest.ui.fragment.LookFragmentTest#testDeleteLookContextMenu` [works](http://catrobatgw.ist.tugraz.at:8080/job/Catroid-single-UI-test/711/console).
`org.catrobat.catroid.uitest.ui.MyProjectsActivityTest#testRenameProject` is highly unstable, [even on `master`](http://catrobatgw.ist.tugraz.at:8080/job/Catroid-single-UI-test/712/console).