Open [your language].catalog
with StyleEdit skip the first line and the line at
the bottom of the file.
Replace the second line
with the name of your language, again in your
language.
The other lines appear in
pairs of two lines: The first is an identifier which
you must not change and the second line is the text
in English which has to be translated. This line has
to be replaced with the translation to your
language.
Note: Some lines
have a leading space or a space at the end, the
translated line of text should have this
too!