Bugfixes and minor changes:

• Improved parallelization of concurrent authentication requests to increase performance
• Don't complain about missing or empty configuration files when reloading the configuration. Default values will be used in that case.
• Fix Let's Encrypt® well-known path normalization to preserve native format.
• FTP: Fixed a crash if both control and data connection fail at the same time

• [p]Localization code and text changes.[/p][/*]