Fix position tracking (0,0) coordinates on Android - fix locale when writing decimals

[tomasMizera]

🫢 Java's String::format uses a default locale when no locale is provided to it. It means that for US/UK locale it used . as the decimal separator. However, for example for SK, it used , -> Qt was unable to parse double with such decimal separator aaaand 💥

We will use the common Locale.US for writing doubles. A workaround until this bug is released is to change the system language to English 🇬🇧🇺🇸 ... or some other place where they use . as decimal separator

Resolves #2781

See https://developer.android.com/reference/java/util/Locale#default_locale:~:text=Be%20wary%20of%20the%20default%20locale

I checked other occurrences of String::format but they look alright.