Updated Brazilian Portuguese translation
View: use g_signal_connect_object()

No need to set the source buffer to NULL on dispose, the signals will be
disconnected automatically.
test-buffer: don't use g_test_trap_fork (deprecated)

g_test_trap_fork() was actually not needed in this case, since the test
must succeed. g_test_trap_fork() is useful when we know that a test
should fail.
test-languagemanager: don't use g_test_trap_fork() (deprecated)