While an UpperCamelCase name is great for use in our technical space to refer to an extension or project, in the real world people will expect things to be labelled descriptively and in proper English. They won't care about sub-product names of MediaWiki. At the very least it should be "revision slider", but one could also use "history" and/or a more descriptive verb than "slide" (e.g. "browse", "compare")
I'm happy to change the name, as long as we come up with it quickly (i.e. before we release it as beta to all wikis, which if all goes as expected, could be in 2 weeks already). Our first brainstorming session did not bring any results, but please let us know your ideas! Maybe @Guycn2, @IKhitron, WMDE-Design or the rest of the WMDE-TechWish can also think of something?
.. after talking again with @WMDE-leszek, maybe it is indeed too late to do a full renaming. So let's improve the wording on all help pages, and write "revision slider" instead of "RevisionSlider" and "With it you can browse through history" and not "you can slide through revisions", but not do a complete renaming
Before closing this: We now have a collapsable box for the revision slider, that is currently titled "revision slider". Let's change the title to "Browse history" to really make it more understandable for the users.