This one is really tricky. You'll see this same behavior by Google, Facebook, and most other major providers. We spent a lot of time looking into this, it's unfortunately a very complex situation:

1- In theory browser language should be the perfect way to do it, in practice as often as 25% of the time or more it's set incorrectly. Unfortunately, that means a lot of people that don't speak English end up with English content.

2- There is more than just language, in several regions we are localized and not just translated. So it's important to send specific content for the region, like prices, specific local features (e.g. payment methods), specific photography to better appeal to the local audience, local user stories & articles, etc.

3- It's especially hard with English because that is, in essence, the "default" language. If your browser language is set to Spanish and you live in Germany, we'll respect that, but it's a bit harder to do with English.

We're definitely open to input on how to handle it better... One step forward would be to bring the language selector up to the top of the page so it is much more accessible.