field_language() caching to strict when creating multiple new entity types with different bundles

When create multiple new entities of the same type with different types of bundles as it will more than likely happen with field collections there is conflicts in the caching which results in the fields language being returned as 0.

When entities have been saved the items will not conflict as they will all have unique ids, but when they are new entity_extract_ids() will return as id of 0 for every entity. and this means if you have 2 new entities of different bundles the first will set the cache, but the second will try and use the first cache.

The solution that I have added is to make the bundle as a part of the cache. this will mean that on new entities will be inserted uniquely, but in the case of existing entities it will only add a single additional level which should have no impact on performance other than an additional level of array.