[mythtv] MythTV japanese i18n and unicode fix and more

[Hirobumi Shimada]

I tried 0.14, very useful 'Search listing' and channel editor in setup.
but unicodes canot display, and I hope translation in setup, 

unicode fix and added translation in setup, added more QObject::tr
 including this patch and mythfrontend_ja.ts file.

sorry my broken english.

Hiro
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