発表の募集を翻訳

締め切りがもう過ぎていてちょっと遅いんですが、最悪来年も使えます。
Fix english on registration page.

Some small changes have been made to the english on the registration
page to make it sound more natural.
Merge pull request #37 from cdepillabout/patch-1

発表の募集を翻訳
Merge pull request #38 from cdepillabout/fix-english-registration-page

Fix english on registration page.