Replace repeated LEFT OUTER JOIN (SELECT callsign, MAX(lastupload) ...) derived-table joins with simpler LEFT JOIN lotw_users lotw across Distances_model, Logbook_model, Logbookadvanced_model, and Worked_all_britain_model. Also remove an unnecessary DISTINCT/inner station_profile join from an optimized Logbook_model subquery. These changes simplify SQL emitted by the CI query builder, improve compatibility and readability, and may improve performance; note that using direct joins can change which lastupload row is returned if multiple lotw_users rows exist for a callsign.
Introduces band, mode, and confirmed-only filters to the Worked All Britain (WAB) award view and details AJAX endpoint. Updates the controller, model, and view logic to support filtering, and adds new localized strings for WAB award UI elements in multiple languages. Also ensures the correct script is loaded for the WAB section and improves the Bands model to check for field existence before filtering by award.
