New strings and a UI change in Orca

[Joanmarie Diggs <joanmarie diggs gmail com>]

The fix for bgo#574344 required some new strings and a UI change.
Regarding the UI change, the Orca team maintains the docs and will be
updating them soon.

As for the new strings:

#. Translators: Orca has a setting which determines which progress
#. bar updates should be announced. The options are all progress
#. bars, only progress bars in the active application, or only
#. progress bars in the current window.
#.
#: ../src/orca/orca_gui_prefs.py:1559 ../src/orca/orca-setup.ui.h:93
msgid "Restrict progress bar updates to:"
msgstr ""

#. Translators: Orca has a setting which determines which progress
#. bar updates should be announced. Choosing "All" means that Orca
#. will present progress bar updates regardless of what application
#. and window they happen to be in.
#.
#: ../src/orca/orca_gui_prefs.py:1571 ../src/orca/orca_gui_prefs.py:3008
msgctxt "ProgressBar"
msgid "All"
msgstr ""

#. Translators: Orca has a setting which determines which progress
#. bar updates should be announced. Choosing "Application" means
#. that Orca will present progress bar updates as long as the
#. progress bar is in the active application (but not necessarily
#. in the current window).
#.
#: ../src/orca/orca_gui_prefs.py:1578
msgctxt "ProgressBar"
msgid "Application"
msgstr ""

#. Translators: Orca has a setting which determines which progress
#. bar updates should be announced. Choosing "Window" means that
#. Orca will present progress bar updates as long as the progress
#. bar is in the active window.
#.
#: ../src/orca/orca_gui_prefs.py:1584 ../src/orca/orca_gui_prefs.py:3016
msgctxt "ProgressBar"
msgid "Window"
msgstr ""

Thanks for all your work! Take care.
--joanie