an alternative form for here_Adv in Bulgarian

src/translator/DictionaryBul.gf

@@ -26463,7 +26463,7 @@ lin herd_V = variants {} ;
 lin herd_V2 = variants {} ;
 lin herder_N = mkN007 "пастир" ;
 lin herdsman_N = mkN031a "говедар" ; ----
-lin here_Adv = ss "тук" ;
+lin here_Adv = ss (variants {"тук"; "тука"}) ;
 lin hereabout_Adv = variants {} ;
 lin hereabouts_Adv = variants {} ;
 lin hereafter_Adv = variants {} ;