fix a-stem deconjugations and some display bugs

background-script.js

@@ -185,7 +185,7 @@ rules.push({type: "neverfinalrule"
 , dec_end:
 ["く","す","つ","う","る","ぐ","ぶ","ぬ","む","う","く"]
 , con_end:
-["か","せ","て","わ","ら","が","ば","な","ま","わ","か"]
+["か","さ","た","わ","ら","が","ば","な","ま","わ","か"]
 , dec_tag:
 ["v5k","v5s","v5t","v5u","v5r","v5g","v5b","v5n","v5m","v5u-s","v5k-s"] // TODO: support あらへん, あらぬ, etc
 , con_tag:"stem-a", detail:"('a' stem)"});