fix typo in italian translation

locale/it/LC_MESSAGES/converse.json

@@ -297,7 +297,7 @@
          ],
          "Log out": [
             null,
-            "Logo out"
+            "Log out"
          ],
          "Contact name": [
             null,
@@ -837,4 +837,4 @@
          ]
       }
    }
-}
+}