Pic1 is not bugy, it simply beacuse german localization is not complete. You can help in translation: login to this site: https://www.transifex.com/projects/p/RaidPlanner/ and translate missing german words.
Pic2 something wrong with your Joomla setup. Please check the following:
Path to Temp folder setting in Server section of Global Configuration is OK. (Should be C:\Apache2\htdocs\tmp or something like that, be carefull, separator must be “\” and not “/” in case of windows)
Please tell me your Joomla version!