[translations] reason for translated strings not showing up / contribution question

[Tomislav Grabic]

Hello,
I have a Drupal installation with English and German translations. For 
some reason, some email texts, which are translated and parts on the 
frontend of the website (I'm using a wide range of modules) don't show 
up when changing the language settings to German. Is this a known bug or 
does anyone know what could be a reason for such behavior?

Also, our translator started adding translations to the de.po exported 
from our installation. I've looked around on the Drupal website, but 
couldn't find info how to filter/export newly translated strings for 
individual modules out of our general de.po file to be able to upload it 
into the cvs. I'd be thankful for any pointers.
regards,

Tomi