For people that read their books digitally, they probably all know of Moon+ Reader the de facto industry standard. However I had a couple issues with Moon Reader, none were show stoppers, but just things that I felt could and should be improved. This led me to looking for alternatives, A LOT! Eventually I stumbled across Legado. It had a user experience that felt sane and modern and it didn't feel like it was bloated by legacy code or design. I've been using it for over a year and though it's not perfect, it's better than M+R for me.
That said, the English translation is sub-par and that's being kind. Subsequently, when I asked the developer to host the translation somewhere it would be easier to translate than on Github, the developer, whom is Chinese and given that their userbase is mostly Chinese and said it wasn't worth the extra work and that is certainly their prerogative.
But… I would honestly like to see this epub reader get the love it deserves from the West. So if anyone would like to contribute to the English translation please make a pull request.
Chinese Strings: https://github.com/gedoor/legado/blob/master/app/src/main/res/values-zh/strings.xml
English Strings: https://github.com/gedoor/legado/blob/master/app/src/main/res/values/strings.xml
IzzyOnDroid Link: https://apt.izzysoft.de/fdroid/index/apk/io.legado.app.release