Update po files
Make uninstall cleanup and autogen.sh improvements

 * make uninstall now also removed the ${pkgdatadir} folder
   instead of leaving the empty folder lying around.
 * autogen.sh now prints a hugh info block showing the current
   status of make variables such as ${prefix}.
Wizard: Add option to change tab title length

 * When the tab title exceeds 25 characters, we
   cut of the first part and add an elipsis, so
   very_very_very_long_string_foo_bar turns into
   ...very_long_string_foo_bar
 * An option to change the maximum title length of
   tabs has been added to the wizard.
 * Fixes #28
Migrate deprecated g_static_mutex_* to g_mutext_*
Wizard.c: Add option to configure fullscreen hotkey
Fix two warnings
Move documentation into header file