* boards/algebra_group.xml.in: removed no more needed data tags
* boards/algebramenu.xml.in: removed no more needed data tags
* boards/chess.xml.in: removed no more needed data tags
* boards/computer.xml.in: removed no more needed data tags
* boards/flags/fr.png: added bevel
* boards/flags/pt.png: added bevel
* boards/flags/pt_BR.png: created
* boards/reading.xml.in: removed no more needed data tags
* src/gcompris/config.c: (gcompris_config_start),
(set_locale_flag), (get_locale_name), (get_next_locale),
(get_previous_locale): fixed locale management to support style fr_FR.UTF-8
* src/gcompris/gcompris.c: (gcompris_get_locale): fixed locale management to support style fr_FR.UTF-8
* src/gcompris/properties.c: (gcompris_properties_new): fixed locale management to support style fr_FR.UTF-8