SQL Server setup media does not support the language.
Applies to: Microsoft SQL Server 2008 R2 or later.
 
Problem Description.
 
You may receive the following error message when trying to install SQL Server 
on a computer:
"This SQL Server setup media does not support the language of the OS, or does 
not have the SQL Server English language version installation files. Use the 
matching language-specific SQL Server media, or install both the language 
specific MUI and change the format and system locales through the regional 
settings in the control panel."
Cause.
This issue is related to the localization enforcement behavior that was put in 
place since SQL Server 2008 R2.
"With SQL Server 2008 R2, there was a localization change made to ensure we 
allow only supported configurations:
- ENU SQL Server installation on ENU OS
- ENU SQL Server installation on LOC OS (where LOC is any SQL-Server supported 
language)
- LOC SQL Server installation on LOC OS (where LOC is the same LCID for both SQL 
Server media and OS language setting)
In the past releases, other combinations were not blocked, but also were not 
fully supported.
The error message is intentional, and you need to match the system locale and 
SQL Server media language according to the rules that are now enforced:
[SQL Server setup media does not support the language of the OS or does not have 
ENU localized files. Use the matching language-specific SQL Server media or 
change the OS locale through control panel.]"
Source: Max Verun – MSFT on 
this thread.