I am located in Germany and when I go to install libreoffice it defaults to German with no option for me to select English.
Adopting language from regional settings instead of the operating system language is generally not the best idea in my opinion.
There are many international users who set the regional settings to the country they live in but still want programs running in their home language.
This is more likely the system language than the regional setting.
installer defaults to regional language
installation should ask the user or default to system language
User Profile Reset: No
What is the reason to file a duplicate, when you already know of the original report, since you had commented there?
Anyway, there's no "idea" behind the current behavior, as already was noted there; it's how the Windows Installer technology works.
*** This bug has been marked as a duplicate of bug 63827 ***