I think this fits quite well as volunteering in particular for the language and hearing impaired community who really depends on the subtitles.
Also I’m not sure what is your working field but if it were like office work or administration and you also did moderating or managing a channel there could be so called “transferable skills” like:
- Creating and Managing a team
- Communication with members (emails, via disqus or kkt)
- creating google docs or google sheets
- working with deadlines (time management)
- keyboarding and digital design skills (for typing and photoshop)
- translation from English language to xxxx (language skills)
- online research (for special wordings)
- participation in discussion boards incl. suggestions (team work)
just as an example… perhaps I missed something out…