Changed menu system in order that it appears integrated

Various changes throughout the code have been made so that the menu system integrates as expected on Android 3.0+ devices but still will use the menu button on older Android devices.

The manual was changed so that the Android back button is used.

I think I have fixed my Eclipse setup for Japanese characters, but GitHub is showing that the comments in Japanese are changed with my pull request. When I compare the files on my computer though with a comparison tool (Meld for example), the files are identical; therefore, is there a problem with GitHub?