doc ja: update po about creating micro blog

update create a table and following table description:
* User
* Comments
* HashTag
* Bigram
* GeoIndex
doc ja: add markup
doc ja: update po about Loading data
Merge pull request #199 from cosmo0920/doc-ja-translate

doc ja: update po about the first half of creating micro blog 

Patch by cosmo0920. Thanks!!!