Handle no-webcam case

Fixed bisq-network/bisq#1618

src/main/resources/i18n/displayStrings.properties

@@ -1096,7 +1096,8 @@ account.notifications.isContentAvailable.warning=Your {0} does not support mobil
   You can still use it but you only will see the notifications if the Bisq mobile app is open. If in background or shut \
   off you will get a generic notification but you will not see any content in the Bisq mobile app. That is due a \
   restriction of Apple with older phone versions.
-
+account.notifications.noWebCamFound.warning=No webcam found.\n\n\
+  Please use the email option to send the token and encryption key from your mobile phone to the Bisq application.
 
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 # DAO