New features and bug fix

Reinitizing subtitle translations:
When you reinitialize a translation of a subtitle trimmed by the software, it's because the software initially trimmed it incorrectly. As a result, all translations of the same verse following this subtitle will also be reinitialized.

Image as background :
Added an option in the global subtitle settings, under the Subtitle Background section, to set an image as background.

Bug fix:
Fixed a bug that prevented subtitles from being displayed if there was no video or image in the background.

Name of backup file:
The name of the generated backup file now also includes the backup date.