Tenant manager Language

Hi,
I have an issue with Thirdlane, that I can't figure out. I hope that you can help me.
I'm using PBX Manager 6.0.1.79 on MTE. I already created some tenants and they are working fine.
When login as "root" I setup the language of the whole system to be in "Spanish" in option "System Settings --> Preferences --> Display Preferences --> Spanish". As soon as I change to Spanish and hit "Save Preferences" all the options are translated to Spanish, which is fine. After this I logout and login as the administrator of a Tenant. I should see everything in Spanish too no?. Because there's no option available to choose the language of the administrator of a tenant, you can only choose the language of the final user panel, where you can login with your extension information.

Please advice on this because I need to do a manual for the sales/support team and most of them don't speak English.

Thank you,
Regards,
Roque.