Index: bbpress.php
===================================================================
--- bbpress.php	(revision 3610)
+++ bbpress.php	(working copy)
@@ -541,6 +541,7 @@
 
 		// Setup paths to current locale file
 		$mofile_local  = $this->lang_dir . '/' . $mofile;
+		$mofile_local = apply_filters( 'bbpress_custom_mofile', $mofile_local );
 		$mofile_global = WP_LANG_DIR . '/bbpress/' . $mofile;
 
 		// Look in local /wp-content/plugins/bbpress/bbp-languages/ folder