power bi embed language issue | Report Iframe url language parameters not working as expected

Hi all, i'm using iframes to show my power bi reports on my site. 

I understand that power bi recognize the user browser language and according to the language set in the browser it change the langue of the report i see via iframe.

I was trying to use url language parameters for the iframe url (language=en&formatlocale=us) but this is only works part of the time: 

when i enter an embed report url to the browser i see English, but if i open the same report url or even a different report url (with the same parameters) the langue changes to the user browser .

How can i make sure my embedded reports will be always be displayed in English - how can i override the power bi language detection and always force it to be English?  

Thanks!