Symptoms

Installed K2 Language Pack 4.6.11 (Preview) (4.13500.0.2), but cannot find the ‘Set Language’ control.

Diagnoses

The 'Set Language' control is a separate Community Project and is not a part of the K2 Language Pack 4.6.11 (Preview) (4.13500.0.2) installation.

The K2 Language Pack 4.6.11 (Preview) (4.13500.0.2)
- Is developed by K2 and is fully supported
- There is not a control associated with this installation. It allows design time and runtime to render in the language selected/detected by the browser.
- It is downloaded from (https://portal.k2.com/downloads/k2smartforms/Default.aspx)

The 'Multilingual' Control
- This is not developed by K2 and not supported in any way shape or form.

- This contains the 'Set Language' control
- It is downloaded from (http://community.k2.com/t5/K2-blackpearl/Multilingual/ba-p/1049) 

Resolution 

After installing the community control, everything was working as expected.