Fix button widths on formula editor keyboard and add regression test

add regression test for button widths on formula editor keyboard

fix button widths in formula editor keyboard

Add assertion error message for FormulaEditorKeyboardTest/testLayout

Change FormulaEditorKeyboardTest/testLayout: all weights in a row have to add up to 1

fix number type in assertEquals

get views dynamically

remove comments
Merge pull request #904 from StefanTischler/master

#668 fix formula editor button widths and add regression test
improve SourceTest
use StringBuilder where possible
made RegEx faster
Merge pull request #935 from Catrobat/improvedSourceTests

improve SourceTests
removed japanese strings
Merge pull request #947 from Catrobat/no_japan_strings

remove japanese translation
Merge branch 'master' into drone2-merge-master

Conflicts:
	catroidSourceTest/src/org/catrobat/catroid/test/code/CheckForAssertionsTest.java
	catroidSourceTest/src/org/catrobat/catroid/test/code/StringsTest.java
Merge branch 'drone2' into drone2-merge-master
Merge branch 'drone2' into drone2-merge-master
Merge branch 'drone2' into drone2-merge-master
dont create >My First drone Project< on startup
test required resources from bricks