Globalize and localize

[y-iihoshi]

I want to support en-US and ja-JP, at least.

• Localize UI elements #38
  • Localize UI elements dynamically #39
• Localize the manual #345
  • Localize the manual except for template formats #343
• Localize HTML templates
• Localize character names #437

[y-iihoshi]

• Localize UI elements

Done by #38.

[y-iihoshi]

Revised by #39.