Add dynamic License Agreement page accept text

Current Installer-Framework does not support hard coding the text into
config.xml anymore. Implement it in corresponding installscript.qs.

Change-Id: Ia19ff8790278d69fd84145543eff13c2c2238ec0
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>