Fix some TCs + improved timing issue:
* COndition instead of sleep
Merge pull request #1111 from Catrobat/fixOpenTestsSept14

Fixes:
ProjectManagerTest#testShouldLoadDefaultProjectIfCannotLoadAnotherProject
SoundFragmentTest#testSelectAllActionModeButton
SpritesListFragmentTest#testSelectAllActionModeButton
Dialog UI-tests for string creation.
Rename from "string" to "ABC".
Refactoring of begin() of actions.
Translation of StringDialog strings for all current languages.
2 tests fixed
Merge pull request #1121 from Catrobat/fixOpenTests

fixes BroadcastBricksTest + DroneBrickLayoutTest
Merge pull request #1078 from Catrobat/FormulaStringExtension

Formula string extension and refactoring
Merge branch 'master' into Catroid_libgdx1.2.0_update
merge with master