The Legends Library compiles all of the in-game lore (ahem) Legends into a searchable database available for offline reading.
Lore from all three languages (English, Français, and Deutsch) are supported. App localization, however, is currently only available in English or Français. If you wish to help with localization – I very much would like a German-speaking volunteer! – please contact me. You only need the ability to access Google Docs.
You can keep an eye on the dev blog to be aware of future additions to the app.
THERE WILL NOT BE iOS SUPPORT. The reason why is covered in the FAQ linked above. Please read it! If you ask this question, I will ignore it. Maybe if Apple changes their policy (haha!), we’ll see.
If you do not have an Android device, but would still like to use the app (on your desktop or laptop), additional information about this can also be found in the blog FAQ.
Update for NOVEMBER 6, 2019
-Updated SDKs to comply with Google requirements
-Searching for phrases was broken at some point; it is now fixed