streams: Update translated errors for stream to channel rename.

Updates translated JsonableError strings that relate to streams
to use channel instead of stream. Separated from other error string
updates as this is a dense area of changes for this rename.

Part of stream to channel rename project.

analytics/tests/test_stats_views.py

@@ -306,7 +306,7 @@ class TestGetChartData(ZulipTestCase):
             },
             subdomain="zephyr",
         )
-        self.assert_json_error(result, "Invalid stream ID")
+        self.assert_json_error(result, "Invalid channel ID")
 
     def test_include_empty_subgroups(self) -> None:
         FillState.objects.create(