Improve translation file

[ghost]

Hi.

Escape characters are not translatable. But some strings (pref_notification_priority_*) have them. I don't include "'" that has far as I know can not be avoided with the default Android translation system. But the other ones can be avoided, and it would make life easier for potential non-programmer translators.

I am also wondering why there is a string (toast_front_string) that is empty.

Regards.

[heruoxin]

Hi, thanks for your translate.

"toast_front_string" is a useless code and I forgot to remove it.

Yes, it's a bad behavior to add '\n' in translate file. But I don't know how to control the layout of PreferenceActivity...

With '\n':

Without '\n'