Does not follow system language on Haiku

[scootergrisen]

I installed SMPlayer 20.4.2 (revision 9306) Qt 5.15.0 and SMTube 18.11.0 on Haiku.
English is used even though the system is using danish.
I can change to danish in preferences in SMPlayer but not in SMTube.
Seems if i set the language to danish and but to system language that it correctly uses danish.
But the first time after installation it does not seem to follow the system language.

Well the website content of SMTube is in danish but not the GUI.

[scootergrisen]

Hvis i select danish language and click OK the GUI is using danish language.
But then if i close SMPlayer and launch it again the GUI is in enligsh but the language drop down is still set to danish.

[scootergrisen]

Also the icon for SMTube in Haiku applications menu looks like 3 cubes (yellow, blue, red).
I don't know if this is some kind of generic icon.