Add some missing plural forms, increment audio version

radio/sdcard/horus/opentx.sdcard.version

@@ -1 +1 @@
-2.2V0001
+2.2V0002

radio/sdcard/taranis/opentx.sdcard.version

@@ -1 +1 @@
-2.2V0001
+2.2V0002

radio/util/tts_en.py

@@ -30,9 +30,9 @@ for i, (s, f) in enumerate([("volt", "volt0"), ("volts", "volt1"),
                             ("milliamp-hour", "mamph0"), ("milliamp-hours", "mamph1"),
                             ("watt", "watt0"), ("watts", "watt1"),
                             ("milli-watt", "mwatt0"), ("milli-watts", "mwatt1"),
-                            ("D B", "db0"),
-                            ("r p m", "rpm0"),
-                            ("g", "g0"),
+                            ("D B", "db0"),("D B", "db1"),
+                            ("r p m", "rpm0"),("r p m", "rpm1"),
+                            ("g", "g0"),("g", "g1"),
                             ("degree", "degree0"), ("degrees", "degree1"),
                             ("radian", "rad0"), ("radians", "rad1"),
                             ("milliliter", "ml0"), ("milliliters", "ml1"),