Subtitle renderer: Fix a typo introduced in 3244957f4563575d22bf109de27a703558611b19.

It had no effect on the output but a slightly slower code path was used.
Subtitle renderer fix: shadow was not drawn when border was very thin.

The issue was introduced in 19fb30b3effa1a8d221240ef42e47aaf8bf9e495.

This commit fixes #2588.
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:

 - Catalan
 - Chinese (simplified)
 - Czech
 - German
 - Galician
 - Malay
 - Portuguese (Brazil)
 - Russian
 - Slovak
 - Swedish
 - Vietnamese
EVR-CP: Repaint only when necessary when paused.

Additionally this seems to fix backward frame-stepping.

This commit fixes #4036.