@Blahbs Oh yeah, it isn't like I currently have 700+ manga in my Reading list and sometimes unable to read for a few days because MD servers have problems so the update stacks on, right?
The tools for your requests are there. You can bookmark/follow a series. Just need to mark your progress with the eye icon left side of the chapter + Reading progress bar if you follow after reading, or if you follow before you read, MD system does that automatically for you.
As for languages, click top right side cog icon, choose filter chapter language and you will only see update in that language, alternatively go to your profile settings you can do that there as well.