I am located in Denmark, and every time I try to install the Flash Player or update it, the installer is in Japanese. As far as I can see, there is no option to change the language.
I guess if there is no option to change language, the installer chooses the language based on OS language or computer location, but then why the heck does it choose japanese!? 
@hans-g.,
Please do not recommend any site other than Adobe.com to download Flash Player. Adobe.com is the only official site to download Flash Player. Other sites are not authorized to host Flash Player and often host malicious installers, resulting in users unwittingly installing malware and viruses. Furthermore, the first site you posted is being blocked by the Adobe IT department which means it is most likely a malicious sites. I have removed this link from your post and forwarded it to the department that deal with this sort of thing.
The Flash Player installer uses the OS language to display the text in the installer. The CC Preferences, recommended by hans-g. won't work for you as Flash Player is not integrated, nor is it included, with CC.
Please go to System Preferences > Language & Region. If Japanese is listed at the top of the 'Language' list this is why Flash Player is displaying in Japanese. If it's not listed at the top, we'll need to investigate further. Please post a screenshot of the Languages & Region window using the instructions here How to post a screenshot in the forum.
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Maria
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