Qt Mobility default deployment (mobility_default_deployment - as defined in features/mobility.prf) does not work when using multiple languages. This is a common problem also for Qt and QtWebkit, but for those this is relatively easy to fix (just clean the default_deployment.pkg_prerules and create your own).

For Qt Mobility, if the mobility_default_deployment variable is cleaned up on the .pro file, it doesn't change anything (the default deployment still goes into the <myapp>_template.pkg file, causing .sis package creation to fail). Actually I have to wipe out that line manually from the .pkg file everytime I want to create a package :/