Remove screenshots

wiki/src/doc/first_steps/bug_reporting.mdwn

@@ -95,11 +95,8 @@ Sending your report
 
 Once you are done writing your report, send it by clicking the *Send* button.
 
-[[!img sending_email.png link=no alt="Sending email"]]
-
-Once your email has been sent correctly you will get the following notification.
-
-[[!img your_message_has_been_sent.png link=no alt="Your message has been sent"]]
+Once your email has been sent correctly you will get the following
+notification: <span class="guilabel">Your message has been sent</span>.
 
 <a id="special_cases"></a>