Browsing Brazilian Portuguese translation

Translators: (Please see the previous, detailed translator notes about
Focus mode and Browse mode.) In order to minimize the amount of work Orca
users need to do to switch between focus mode and browse mode, Orca attempts
to automatically switch to the mode which is appropriate to the current
web element. Sometimes, however, this automatic mode switching is not what
the user wants. A good example being web apps which have their own keyboard
navigation and use interaction model. As a result, Orca has a command which
enables setting a "sticky" focus mode which disables all automatic toggling.
This string is associated with the Orca command to enable sticky focus mode.