VMR-7 renderless: subtitles were not displayed except in fullscreen.

This issue was introduced in aa4a1acb57fc28fd464942d48b5f9987d88df82f.
VMR-9 renderless: Always try to update the subtitle displayed when seeking while paused.

Ignore invalid timestamps since we use the one from the pin hook anyway.

VMR-7 renderless seemed unaffected by that issue but make the code consistent anyway.

Refs: ticket #3763.
EVR-CP: Always update the subtitle displayed when seeking while paused.

Fixes #3763.
Update translations from Transifex:

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