Fixed Script, various improvements

[xenco]

• refactor: removed tts_batch method in favor of tts method, because it basically does the same thing. The tts_batch method used the wrong server though, resulting in invalid session_id errors
• refactor: fixed formatting
• fix: main method was not called
• fix: added checks before creating and deleting batch directory
• chore: added replacements for german umlauts

[oscie57]

thank you very much! when going through the previous pr by the other person, i didnt actually notice that there was a hard coded test in there, so im glad you were able to fix that and a lot of other things