checkboxes removed after delete dialog is cancelled.
Merge pull request #984 from Catrobat/cat-853

checkboxes removed after delete dialog is cancelled.
CAT-853
fixed english translation: "Click" & "Press" --> "Tap"
fixed german translation: "Klicke" --> "Tippe"
Merge pull request #986 from Catrobat/issue#976

fixed issue #976 (localization strings)
fixed issues #910, #909 and #906

Feature_Backpack_Enabled can be set in build.gradle

changed the strings accordingly

removed checkstyle warning

added check if BuildConfig.FEATURE_BACKPACK_ENABLED is true