Add option to specify default subtitle language

[ianjsikes]

Many of the subtitle files I try to process are skipped because "subtitle language can't be detected". It would be nice to have an option to specify a fallback language in these cases.

Example of a file that isn't processed:

Soul.2020.720p.WEBRip.800MB.x264-GalaxyRG.srt

I thought this would be the behavior of the --language flag. Maybe it warrants a new option to avoid changing the default behavior.

[jkwill87]

I thought this would be the behavior of the --language flag. Maybe it warrants a new option to avoid changing the default behavior.

Given that the main use case for subtitles is to watch media in another language than it was dubbed, subtitles files typically don't match their accompanying media files. Also, multiple subtitle files are included with a given release. My concern is that if language or some other config setting applied to subtitles it would be too easy to misattribute the language or overwrite files when running mnamer on a directory or recursively.