i18n: fix string puzzles in error messages

Do not split the error messages and the error details, but rather use a
single string with proper placeholders. This avoids string puzzles.

Reviewed-by: Cole Robinson <crobinso@redhat.com>
Signed-off-by: Pino Toscano <ptoscano@redhat.com>

virtManager/details/console.py

@@ -736,7 +736,7 @@ class vmmConsolePages(vmmGObjectUI):
         except Exception as e:
             log.exception("Error connection to graphical console")
             self._activate_unavailable_page(
-                    _("Error connecting to graphical console") + ":\n%s" % e)
+                    _("Error connecting to graphical console:\n%s") % e)
 
     def _set_credentials(self, src_ignore=None):
         passwd = self.widget("console-auth-password")

virtManager/details/viewers.py

@@ -461,8 +461,10 @@ class VNCViewer(Viewer):
             self._sockfd = sock
         except Exception as e:
             raise RuntimeError(
-                (_("Error opening socket path '%s'") % self._ginfo.gsocket) +
-                (": %s" % e))
+                _("Error opening socket path '%(path)s': %(error)s") % {
+                    "path": self._ginfo.gsocket,
+                    "error": e,
+                })
 
         fd = self._sockfd.fileno()
         if fd < 0: