* store logging path in Config class
* rename template files and page files
* jump to referer page
- after changing the language, we jump to
the referer page, if the attribute exists
* build and send list of log-files
* rename Download page into Log files
* initialize log-path in test config
* improve dashboard unit tests
- add log file tests
- check content-languages after language switch
* initialize config structure for log-file tests
* add test log file to project
* add sub_dir to test log path
- non files must be skipped. To test this we add
a sub directory to the test log directory
* add german translations
* set quart debug flag for debug versions
* update changelog
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