Minor tweaks to text phrases and icons

bigbluebutton-client/locale/en_US/bbbResources.properties

@@ -19,12 +19,12 @@ bbb.micSettings.microphone.header = Test Microphone
 bbb.micSettings.playSound = Test Speakers
 bbb.micSettings.playSound.toolTip = Play music to test your speakers
 bbb.micSettings.hearFromHeadset = You should hear audio in your headset, not your computer speakers.
-bbb.micSettings.speakIntoMic = Speak into your microphone. If you are using a headset, you should hear audio from your headset and not from your computer speakers.
-bbb.micSettings.echoTestMicPrompt = Do you hear any audio?
+bbb.micSettings.speakIntoMic = Speak a few words into your microphone.  If you are using a headset (or earbuds), you should hear the audio from your headset -- not from your computer speakers.
+bbb.micSettings.echoTestMicPrompt = Did you hear audio when you speak?
 bbb.micSettings.echoTestAudioYes = Yes
 bbb.micSettings.echoTestAudioNo = No
 bbb.micSettings.speakIntoMicTestLevel = Speak into your microphone. You should see the bar move. If not, choose another mic.
-bbb.micSettings.recommendHeadset = Recommend you use a headset or earbuds. Otherwise, you will create echo.
+bbb.micSettings.recommendHeadset = Use a headset with a microphone for best audio experience.  (Use earbuds if you don't have a headset)
 bbb.micSettings.changeMic = Test or Change Microphone
 bbb.micSettings.changeMic.toolTip = Open the Flash Player microphone settings dialog box
 bbb.micSettings.comboMicList.toolTip = Select a microphone