I have the same question, basically power.com pick up my german locale (I guess) and there is no way to swith things in English.
Same here! it is so aggravating how MS is always shoving a language down our throat without offering the ability to change it back to English. WHY?
Edit: you can now change language in the settings of Power BI!
Maybe because I am located in France powerbi.com is displayed in French.
How to switch to English ?
I tried looking in https://app.powerbi.com/groups/me/settings/general but I did not find a way to change the langage.
Decopin's reference should work. It is controlled by the language of the browser.
A note for Chrome, even if you add Spanish to the list, it will go off of whatever is the first listed language. For example, i have English (United States) and Spanish listed. English is first. This results in the following HTTP Header.
If I most Spanish to be first, I then see the following HTTP Header.