[gdm3] Some proposed fixes concerning i18n

[Gert Michael Kulyk]

> You should get them proof-read on debian-l10n-german, as
> there are some mistakes

Whoops, you're right. Maybe the next time I should not try to translate
strings past 6 pm. ;-)

I'm attaching a corrected file, hopefully this time I got all
grammatical errors. I'll post the po files for additional proof-reading
(this one and the translation for default.desktop) to debian-l10n-german
later, too.

Regards,

Gert Kulyk
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