Closed #30

Should still probably show some response indicating that the vocab is
loading as response time takes a second or two.
Closed #27

Checks last char in string. If it's "n", convert it to "ん" Also some
mild JS comment addition.
Closing #31

Fixed hyphens in Hiragana. Had to modify the WK Library to do it though.
Not a beautiful fix, but it works.
Essentially adding the unicode for the dash, ー to be checked against
when verifying whether a character is hiragana
Closed #32

Autorefresh of the button upon addition of new reviews. on 0, the button
stays disabled.  Also changed a logging line in Tasks