[translations] ease your installer.po translation

[Gabor Hojtsy]

Hi,

The POT files published for Drupal 5 RC1 contain an installer.po. This can 
be used by Drupal in install time from the file system, so that the user 
can set up Drupal on a translated interface. Since some of the Drupal 
interface shows up in installation time, the installer.po file shares some 
strings with other files.

Watch out for the file comments above the strings. If a file comment 
starts with "(duplicate)", it means that you have a translation for that 
string already done in a different file, so you can (and should) merge 
your translations from there.

Gabor