Improve logging

[Hellgartner]

• Check the various log messages appearing:
• Currently, everything is logged at the root level: warning:root <Message>. Make sure the proper module is mentioned here
• Make sure the messages are actionable, especially double check all relevant information for the user is provided: e.g. If the validation fails the log should contain the issues which appeared and not only the fact that they failed
• Double check whether the conversion needs to be abortable on error, e.g. in case of unintended override
• Check usage of log level