Browsing Portuguese translation

TRANSLATORS: This is the filename of the `About Inkscape' picture in
the `screens' directory.  Thus the translation of "about.svg" should be
the filename of its translated version, e.g. about.zh.svg for Chinese.

Please don't translate the filename unless the translated picture exists.
FIXME? INKSCAPE_SCREENSDIR and "about.svg" are in UTF-8, not the
native filename encoding... and the filename passed to sp_document_new
should be in UTF-*8..