voice: Convert a pile of splashf() messages to be voiced

Basically, this just replaces str(STRID) with ID2P(STRID).

The voiced version of these strings cannot not have any format
specifiers (enforced by the language tooling) and are instead more
generic.

As many of these are error conditions, it is doubly important for
them to be voiced in some way.

There are some places in the code that perform their own voicing
for splash messages (eg the shutdown code); those are left alone.

Change-Id: I7d51af351e8fa5c4beee42fbfc02719f1d6591b8

apps/root_menu.c

@@ -257,7 +257,7 @@ static int browser(void* param)
                     }
                     else
                     {
-                        splashf(0, str(LANG_BUILDING_DATABASE),
+                        splashf(0, ID2P(LANG_BUILDING_DATABASE),
                                    stat->processed_entries);
                     }
                 }