Only one subtitle appears at time

When more than a subtitle should appear on screen (i.e. voice's translation and signboard translation), it appears only the one at the top, which is usually the signboard translation. It happens often in anime fansub and it can ruin the vision of the show.

Launchpad Details: [#LP1626066](https://bugs.launchpad.net/bugs/1626066) Aelit - 2016-09-21 12:18:51 +0000

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