Rename sound files with -fr suffix for French tones

Add country suffix to sound filenames to clarify the tone standard
in use. Remove the unsuffixed and North American variants.

data/meson.build

@@ -113,7 +113,7 @@ endif
 
 # Sounds (fallback for systems without telephony events in sound theme)
 install_data(
-  'sounds/phone-outgoing-calling.oga',
-  'sounds/phone-outgoing-busy.oga',
+  'sounds/phone-outgoing-calling-fr.oga',
+  'sounds/phone-outgoing-busy-fr.oga',
   install_dir: join_paths(datadir, calls_name, 'sounds'),
 )

src/calls-media-playback.c

@@ -104,10 +104,10 @@ playback_event_to_filename (PlaybackEvent event)
 {
   switch (event) {
   case PLAYBACK_CALLING:
-    return CALLS_SOUNDS_DIR "/phone-outgoing-calling.oga";
+    return CALLS_SOUNDS_DIR "/phone-outgoing-calling-fr.oga";
 
   case PLAYBACK_BUSY:
-    return CALLS_SOUNDS_DIR "/phone-outgoing-busy.oga";
+    return CALLS_SOUNDS_DIR "/phone-outgoing-busy-fr.oga";
 
   case PLAYBACK_LAST:
   default: