PDOException when i18n_taxonomy module not enabled

The i18n_taxonomy module creates a language column for the taxonomy_term_data table. The code was assuming that column is always there but needs to check if that module is enabled.

PDOException: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'td.language' in 'field list': SELECT td.tid AS tid, td.vid AS vid, td.name AS name, td.description AS description, td.format AS format, td.weight AS weight, td.language AS language FROM {taxonomy_term_data} td INNER JOIN {taxonomy_index} ti ON td.tid = ti.tid WHERE (td.vid = :db_condition_placeholder_0) AND (ti.nid = :db_condition_placeholder_1) ORDER BY weight ASC; Array ( [:db_condition_placeholder_0] => 1 [:db_condition_placeholder_1] => 5 ) in featured_content_get_node_terms_by_vocabulary() (line 1820 of /Users/kristen/sites/projects/fc7/sites/all/modules/fc7/featured_content.module).