Adding a Date field to Fields in View adds a Language Filter in where-clause.

I don´t understand the sense of this behaviour.
Adding a Date field adds automatic a Language-Filter in the Where-Clause of the SQL-String.

Default Calendar View
SELECT node.nid AS nid, node_revision.timestamp AS node_revision_timestamp, 'node' AS field_data_body_node_entity_type
FROM
{node} node
LEFT JOIN {field_data_field_datum} field_data_field_datum ON node.nid = field_data_field_datum.entity_id AND (field_data_field_datum.entity_type = :views_join_condition_0 AND field_data_field_datum.deleted = :views_join_condition_1)
LEFT JOIN {node_revision} node_revision ON node.vid = node_revision.vid
WHERE (( (node.status = '1') )AND( (DATE_FORMAT(ADDTIME(STR_TO_DATE(field_data_field_datum.field_datum_value, '%Y-%m-%dT%T'), SEC_TO_TIME(3600)), '%Y-%m') = '2011-03') ))

Set Field to a Date Field (Adds language in Where-Clause)
SELECT node.nid AS nid, field_data_field_datum.delta AS field_data_field_datum_delta, field_data_field_datum.language AS field_data_field_datum_language, field_data_field_datum.bundle AS field_data_field_datum_bundle, field_data_field_datum.field_datum_value AS field_data_field_datum_field_datum_value, field_data_field_datum.revision_id AS field_data_field_datum_revision_id, 'node' AS field_data_body_node_entity_type, 'node' AS field_data_field_datum_node_entity_type
FROM
{node} node
LEFT JOIN {field_data_field_datum} field_data_field_datum ON node.nid = field_data_field_datum.entity_id AND (field_data_field_datum.entity_type = :views_join_condition_0 AND field_data_field_datum.deleted = :views_join_condition_1)
WHERE (( (node.status = '1') AND (field_data_field_datum.language = 'en') )AND( (DATE_FORMAT(ADDTIME(STR_TO_DATE(field_data_field_datum.field_datum_value, '%Y-%m-%dT%T'), SEC_TO_TIME(3600)), '%Y-%m') = '2011-03') ))

What does that mean for multi-language Sites?
That english people can only see english dates and german people only german dates while they use the same calendar?

Bug, Feature or PEBKAC?