About [[Mifos:ManageLoanProducts.defineLoanProduct.loanCycleNo.zero/de]]

Uh emm probably. Might be easier to just remove this message from translation (after the bug is found and fixed???)

Not sure. Is the number zero always written as "0" or are there scripts where it looks differently? In the former case it could be ignored, in the latter, it should probably be optional.