Translations for lines 1373 - 2097

Japanese insufficient or missing at the following lines:

1430 日本語がない
1467 タイプが指定されたら、そのタイプのリスナーだけを消す。指定されていないなら、全部を消す。
1695 ロードされた画像だけを指しているが、画像も音もロードできるから

I don't know Japanese programming terminology well enough to fix these
myself. The notes are in Japanese because they are likely to be fixed by
a native speaker... and if not, I presume notes in Japanese will pose no
problem for whoever does fix them.

Japanese translations also needed for most of enchant.Event.
enchant.Event is before line 1373, but I forgot to make this note in my
previous commit.