Query alteration for tmgmt_entity when generating sources overview page

Problem/Motivation

Currently there is no way of altering the TMGMT Entity sources overview page. It might be useful to have more control over the query that is ran in order to generate that page. A possible application could be building an Organic Group integration that would list only entities belonging to that group.

Proposed resolution

The solution would be adding a query alteration tag in tmgmt_entity_get_translatable_entities() right after creating the main query constructor:

...
  $query = db_select($entity_info['base table'], 'e');
 + $query->addTag('tmgmt_entity_get_translatable_entities');
...

Remaining tasks

None.

User interface changes

None.

API changes

None.