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We experiment replacing some BBB / freeswitch sound files with language independent sound icons.

ls /opt/freeswitch/share/freeswitch/sounds/en/us/callie/conference/8000/
conf-alone.wav                          conf-enter_conf_pin.wav  conf-is-locked.wav                conf-members_in_conference.wav        conf-pin.wav
conf-bad-pin.wav                        conf-entry_sound.wav     conf-is-unlocked.wav              conf-muted.wav                        conf-qna_mode.wav
conf-conference_is_full.wav             conf-exit_sound.wav      conf-kicked.wav                   conf-number_of_listeners.wav          conf-unmuted.wav
conf-conference_is_in_qna_mode.wav      conf-goodbye.wav         conf-listener_in_conference.wav   conf-one_other_member_conference.wav  conf-welcome.wav
conf-conference_will_start_shortly.wav  conf-has_joined.wav      conf-listeners_in_conference.wav  conf-one_other_person_conference.wav  conf-you_are_already_muted.wav
conf-enter_conf_number.wav              conf-has_left.wav        conf-locked.wav                   conf-other_persons_conference.wav     conf-you_are_now_bidirectionally_muted.wav

short list:

• conf-muted.wav
• conf-unmuted.wav
• conf-bad-pin.wav
• conf-enter_conf_pin.wav
• conf-conference_will_start_shortly.wav
• conf-goodbye.wav
• conf-exit_sound.wav
• conf-entry_sound.wav
• conf-has_left.wav
• conf-pin.wav
• conf-welcome.wav
• conf-unmuted.wav

see also /opt/freeswitch/etc/freeswitch/autoload_configs/conference.conf.xml

    <profile name="cdquality">
      <param name="domain" value="$${domain}"/>
      <param name="rate" value="48000"/>
      <param name="interval" value="20"/>
      <param name="energy-level" value="100"/>
      <!-- <param name="sound-prefix" value="$${sounds_dir}/en/us/callie"/> -->
      <param name="muted-sound" value="conference/conf-muted.wav"/>
      <param name="unmuted-sound" value="conference/conf-unmuted.wav"/>
      <param name="alone-sound" value="conference/conf-alone.wav"/>
<!--
      <param name="moh-sound" value="$${hold_music}"/>
      <param name="enter-sound" value="tone_stream://%(200,0,500,600,700)"/>
      <param name="exit-sound" value="tone_stream://%(500,0,300,200,100,50,25)"/>
      <param name="kicked-sound" value="conference/conf-kicked.wav"/>
-->
      <param name="locked-sound" value="conference/conf-locked.wav"/>
      <param name="is-locked-sound" value="conference/conf-is-locked.wav"/>
      <param name="is-unlocked-sound" value="conference/conf-is-unlocked.wav"/>
      <param name="pin-sound" value="conference/conf-pin.wav"/>
      <param name="bad-pin-sound" value="conference/conf-bad-pin.wav"/>
      <param name="caller-id-name" value="$${outbound_caller_name}"/>
      <param name="caller-id-number" value="$${outbound_caller_id}"/>
      <!-- param name="comfort-noise" value="true"/ -->
      <param name="comfort-noise" value="1400"/>

to apply changes see https://docs.bigbluebutton.org/2.2/customize.html#turn-off-you-are-now-muted

Upload folder for samples: https://fairkom.net/nextcloud/index.php/s/9Cx6rTWyH6tZDFW