Remove KGlobal::locale warning for pure Qt applications
Pure Qt applications get KDE dialogs through the various KFileDialogQtOverride members, these functions instantiate a KFileDialog that inherits from KDialog so on KFileDialog construction we end up in KDialogPrivate::init that calls KDialog::setButtons that uses KStandardGuiItem::ok() that has a i18n call. Since there is no valid main component at this stage yet once we get to the fileModule() call and it creates a proper main component we will get the KGlobal::locale warning.
By invoking fileModule() before creating the KFileDialog we avoid this issue.
Acked by dfaure