S allius/issue394 (#400)

* 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

app/src/server.py

@@ -179,7 +179,8 @@ def main():   # pragma: no cover
     asyncio.set_event_loop(loop)
 
     # read config file
-    Config.init(ConfigReadToml(src_dir + "cnf/default_config.toml"))
+    Config.init(ConfigReadToml(src_dir + "cnf/default_config.toml"),
+                log_path=args.log_path)
     ConfigReadEnv()
     ConfigReadJson(args.config_path + "config.json")
     ConfigReadToml(args.config_path + "config.toml")
@@ -214,7 +215,7 @@ def main():   # pragma: no cover
         ProxyState.set_up(True)
         logging.info("Start Quart")
         app.run(host='0.0.0.0', port=8127, use_reloader=False, loop=loop,
-                debug=True,)
+                debug=log_level == logging.DEBUG)
         logging.info("Quart stopped")
 
     except KeyboardInterrupt: