Have you ever gotten some "odd automatic things" because of learning a language.
Just to give a few examples, these things have happened to me:
Just now, I click the "update" button in office 365 and I get screens in ... Portuguese. My OS and office are set to English as default language. Proof. As you can see my base language is English ... yet I've magically gotten the pop-up screens in Portuguese xD (has never happened before.). Nice one Luis -insert suspicious look here- :P.
In the past: google suddenly and automatically showing search results in Spanish instead of English.
Automatically getting Portuguese / Spanish (also French but that's an official language of my country thus not odd) as display language on some websites sometimes (without clicking any links with language tags).
On the plus side, if you manage to "confuse" Google and Microsoft into doubting your location and language, it shows that they don't know "everything" (however they certainly do / should know).
Soon I'm going to add some safety layers where possible though, as lately data isn't just used more often it's also exponentially often getting abused. Legislation is inadequate and when looking at the US, the republican government is currently completely destroying any privacy and protection on the internet.
I have some Excel workbooks with tabs labelled Лист1, Лист2, etc. I also sometimes get travel ads in Bulgarian, but I think that is due more to my planning my holiday and booking a one-way flight from Bourgas, than it is due to my studying Bulgarian. I do store vocabulary in a spreadsheet, so the first is understandable, even though it happens in unrelated workbooks.