fix range input in chart data source dialog

Change-Id: I9c139c6298d25c7a7072d0d0538f1945518d36f2
use better default colors

Change-Id: I0790f157632351a8fe68abf8f12041907027d6c9
small text positioning fixes

Change-Id: I7fb42f0c34c5216421324f471a813f4668b4a878