Merge common/styles.xml (which contains only the special default style)
with common/common_styles.xml.
Rename common/common_sprites.xml to common/sprites.xml.
This was SVN commit r18637.
Move remains of common/sprite1.xml to common/common_sprites.xml.
Remove duplicates bkFillBlack and bkTranslucent.
Rename bkWhiteBorderBlack to BackgroundWhiteBorderBlack.
Move BackgroundSessionTooltip and BackgroundInformationTooltip to
session/.
Remove unused BackgroundErrorTooltip.
This was SVN commit r18636.