Hey, I'm excited to tell you that I was able to unlock this version 10 update to Events. Although other parts of the Memorium remain locked, and all of the previous Memoriums cannot be unlocked. (I've already skiping Ludwig's route again and still haven't unlocked anything new.) I can't guess what the reason is, but I'd love to tell you about this development. If it doesn't bother you, I hope you can check if there are any changes in this update of Events.
That's good! Some of the events in Update 10 unlock automatically. This likely happens because of the plugin you mentioned that translated the game. Since the clickable things to unlock in the Memorium are part of the text and I'm guessing that this plugin ends up removing the links, therefore making them unclickable.
Maybe try going through the game without this plugin and you will see some text highlighted in pink sometimes. Those are the clickable memories that unlock them in the Memorium once seen.
Ah, after constantly skipping and going back, I finally clicked on most of the purple text. I'm so happy that I've finally been able to unlock things in Memorium, I love these things in Memorium, they're so cute. Although I still have four things locked. Inevitably I missed a few, but it's a big step forward and I'm very happy. I swear I clearly remember not seeing purple text in any version of the game before version 10, because there was no way I hadn't clicked on any of them. (I have seen similar text designs before) it's possible that the translation plugin has somehow gotten in the way before. However, the translation plugin is also being updated, and this time I found that even using the plugin now shows purple text normally in the game. All in all, I'm very sorry for the trouble brought to you. Thank you very much for your patience.