Fixed wrong translation string

Removed unused variables from callback in server.py
Update Testresults

cps/tasks/convert.py

@@ -193,7 +193,7 @@ class TaskConvert(CalibreTask):
                 ele = ele.decode('utf-8')
             log.debug(ele.strip('\n'))
             if not ele.startswith('Traceback') and not ele.startswith('  File'):
-                error_message = _("Calibre failed with error: %(error)s", ele.strip('\n'))
+                error_message = _("Calibre failed with error: %(error)s", error=ele.strip('\n'))
         return check, error_message
 
     @property

cps/tasks/mail.py

@@ -175,6 +175,8 @@ class TaskEmail(CalibreTask):
                 text = e.smtp_error.decode('utf-8').replace("\n", '. ')
             elif hasattr(e, "message"):
                 text = e.message
+            elif hasattr(e, "args"):
+                text = '\n'.join(e.args)
             else:
                 log.exception(e)
                 text = ''