Do not use the translated summary to get the value from gettext in the bundle builder

The bundlebuilder was trying to get a translation using a summary already translated to the language selected in the developer environment. This was not a problem to developers using "en", but i different, gettext couldn't find the translation and copied the same summary in all the activity.linfo files.
 
Signed-off-by: Gonzalo Odiard <gonzalo@laptop.org>