Improved scoreboard.

 - Optimizations;
 - better management of long episodes (displayed timer: hh:mm:ss, if an episode is longer than 1 hour).
Fixed an i18n bug.
(Impossible to add an user-only translation file without a crash (NPE) when the plugin starts.)
Timer optimization.

Minimization of the time between the reset of the old "timer" score and the registration of the new one.
(Yes, it's a VERY light optimization.)