SubtitleInputPin: Handle samples without time.

This commit fixes DVB subtitles for live broadcast. We discard samples
without time for text subtitles since they make no sense there.
Add a Fulah translation.

The composition of the translation team can be found on Transifex: https://www.transifex.com/organization/mpc-hc/team/3979/members/ff/.
Add a Finnish translation.

The composition of the translation team can be found on Transifex: https://www.transifex.com/organization/mpc-hc/team/3979/members/fi/.
Add an Indonesian translation.

The composition of the translation team can be found on Transifex: https://www.transifex.com/organization/mpc-hc/team/3979/members/id/.
Add a Bulgarian translation.

The composition of the translation team can be found on Transifex: https://www.transifex.com/organization/mpc-hc/team/3979/members/bg/.