YouTube Audio Skill - testing and feedback

Hi, first of all: thanks for sharing this great stuff!
In the default settings everything is working fine.

But is there a way to change the language? At the moment I am using mycroft with german language support, following this:

https://community.openconversational.ai/t/how-to-change-mycroft-language-to-german/6845

When I evoke a stream by (typing) “spiele Hendrix” (=“play Hendrix”) mycroft says “eine sekunde bitte” (=“a second please”) but than an error is thrown out, saying “Bei der Bearbeitung ist ein Fehler im Skill Youtube Skill aufgetreten” (Roughly=“there was an error in the Skill youtube Skill”). Skill’s log says:

2019-12-17 09:52:54.439 | INFO | 8167 |
mycroft.skills.skill_loader:load:112 | ATTEMPTING TO LOAD SKILL:
mycroft-youtube-audio
2019-12-17 09:52:54.675 | INFO | 8167 |
mycroft.skills.settings:get_local_settings:78 | /opt/mycroft/skills
/mycroft-youtube-audio/settings.json
2019-12-17 09:52:54.710 | INFO | 8167 |
mycroft.skills.skill_loader:_communicate_load_status:270 | Skill
mycroft-youtube-audio loaded successfully
2019-12-17 09:54:19.921 | INFO | 8167 |
mycroft.skills.settings:save_settings:109 | Skill settings successfully
saved to /opt/mycroft/skills/mycroft-youtube-audio/settings.json
2019-12-17 09:54:24.072 | INFO | 8167 | Playback Control Skill |
Playing with: mycroft-youtube-audio
File “/opt/mycroft/skills/mycroft-youtube-audio/init.py”, line 67,
in CPS_start
self.search_youtube(data)
File “/opt/mycroft/skills/mycroft-youtube-audio/init.py”, line 91,
in search_youtube

Also there was a regex error, so I’ve added de-de in locale; so this message is gone.

As I am totally new to mycroft my understanding of how things work is very few. It would be great if someone could point me to the place where this error-message comes from. Is it from the skill or from mycroft itself? Does anyone know if I could try some translations somewhere?