We believe that your issue has been closed by the upload of
Version 0.9.6 of grml-autoconfig from Michael Prokop <mika@grml.org>.
The explanation is attached below

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Hash: SHA1

Format: 1.8
Date: Fri, 26 Feb 2010 21:49:00 +0100
Source: grml-autoconfig
Binary: grml-autoconfig
Architecture: source all
Version: 0.9.6
Distribution: unstable
Urgency: low
Maintainer: Michael Prokop <mika@grml.org>
Changed-By: Michael Prokop <mika@grml.org>
Description: 
 grml-autoconfig - main bootup process of a Grml (based) system
Changes: 
 grml-autoconfig (0.9.6) unstable; urgency=low
 .
   * Use Lat15-Terminus16 instead of lat1-16/lat10-16 to address
     broken lang=pt feature. [Closes: issue691]
   * Deprecate home=... bootoption and drop the mkpersistenthome
     script. The home feature has too many flaws and nowadays
     the persistency feature should be used instead.
     [Closes: issue449]
   * Bump to Standards-Version 3.8.4.
Checksums-Sha1: 
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 691304e9bbfc873290b30fedd682784b02927b6b 69656 grml-autoconfig_0.9.6.tar.gz
 6c982a170c8df268ff975bb199d82ffaaab94eae 89592 grml-autoconfig_0.9.6_all.deb
Checksums-Sha256: 
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Files: 
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 34c58ab90b6967a7963fd13bbb993c98 69656 grml optional grml-autoconfig_0.9.6.tar.gz
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Try to use grml keyboard=pt-latin1 

The problem is that the keyboard boot argument is not looked up in the language
definition. This could be solved but only after refactoring of grml-scripts and
grml-autoconfig.

'grml lang=pt' works for the keyboard setup but complains about font file 
'lat10-16'. On the other hand 'grml keyboard=pt' doesn't seem to work at all.

Brought up by Antonio P. P. Almeida.