Orca: String-freeze break request

[Joanmarie Diggs <jdiggs igalia com>]

TL;DR: No good deed goes unpunished. Please, please grant this request.
https://bugzilla.gnome.org/show_bug.cgi?id=736214

Proposed strings (3):

+# Translators: Orca's verbosity levels control how much (or how little)
+# Orca will speak when presenting objects as the user navigates within
+# applications and reads content. The levels can be toggled via 
command.
+# This string describes that command.
+TOGGLE_SPEECH_VERBOSITY = _("Toggles speech verbosity level.")

+# Translators: Orca's verbosity levels control how much (or how little)
+# Orca will speak when presenting objects as the user navigates within
+# applications and reads content. The two levels are "brief" and 
"verbose".
+# The following string is a message spoken to the user upon toggling
+# this setting via command.
+SPEECH_VERBOSITY_BRIEF = C_("Speech", "Verbosity level: brief")

+# Translators: Orca's verbosity levels control how much (or how little)
+# Orca will speak when presenting objects as the user navigates within
+# applications and reads content. The two levels are "brief" and 
"verbose".
+# The following string is a message spoken to the user upon toggling
+# this setting via command.
+SPEECH_VERBOSITY_VERBOSE = C_("Speech", "Verbosity level: verbose")

Detailed explanation:

"Clickable" elements are those which have an onClick handler. Sadly, 
these elements tend to be text spans that are not focusable, not 
discoverable, and thus inaccessible. Orca now announces their presence 
and provides means to navigate to them and activate them. As a result, 
these formerly inaccessible elements are now accessible. This new 
feature was added during the 3.13/3.14 release cycle. And there was much 
rejoicing. Until....

From user testing, I've recently learned that certain sites, see Voice 
of America's "learn english" content as an example, makes pretty much 
EVERY word clickable so that (sighted, mouse-using) learners can click 
on a word and have that word's definition pop up. This unfortunately 
makes the content unreadable at Orca's "verbose" level of speech 
verbosity. ("This clickable makes clickable the content clickable 
unreadable clickable at Orca clickable 's level clickable of speech 
clickable verbosity clickable ."). :(

Such sites indicate that it is no longer the case that there is a single 
verbosity level that should JustWork(tm) for the user. It needs to be 
toggle-able. I've made this change and committed it to master. I'd 
really (really, really, really) like to commit it to the 3.14 branch. 
Please and thank you. :)

--joanie