The slang 1.4.9dbs-8 packages are needed in testing for fixing a crash experienced when dealing with zero-size characters in RTL languages such as Arabic.
This version of the package includes a patch by Steve Langasek and Bastian Blank which fixes this bug. It has been well tested inside D-I with sid udebs.... As, the last needed build for these packages happened yesterday, I think that pushing it into testing is OK. Doing it as soon as possible will give us a chance that it reaches the soon to be built D-I TC2 boot images, especially the netinst ISOs.... --