Updated build scripts for Vaadin 7 translations. #12954

Change-Id: I35196c68f40fcbf693e581fec1baac86d09a1d5f
Updated translation files for current Vaadin 7 edition of the book. #12954

Change-Id: If1faff6c09b1a95c99bb29b4d0ed900df125ec35
Removed obsolete translation files for Vaadin 7. #12954

Change-Id: If82a1c2d97eaeb58d598703ef6ec1f386d6e95ca