audio_level oppacity and addParticipant button name

interface_config.js

     DISABLE_DOMINANT_SPEAKER_INDICATOR: false,
     // disables the ringing sound when the RingOverlay is shown.
     DISABLE_RINGING: false,
-    AUDIO_LEVEL_PRIMARY_COLOR: "rgba(255,255,255,0.7)",
-    AUDIO_LEVEL_SECONDARY_COLOR: "rgba(255,255,255,0.4)"
+    AUDIO_LEVEL_PRIMARY_COLOR: "rgba(255,255,255,0.4)",
+    AUDIO_LEVEL_SECONDARY_COLOR: "rgba(255,255,255,0.2)"
 };

lang/main.json

 {
     "contactlist": "Participants (__pcount__)",
-    "addParticipants": "Add Participants",
+    "addParticipants": "Share the link",
     "roomLocked": "Callers must enter a password",
     "roomUnlocked": "Anyone with the link can join",
     "passwordSetRemotely": "set by another participant",