Editora 0.10.0. Archived, so links from that release keep working. Read the 0.18.5 page →
Abbreviations: Manage…
abbrev.manage Open the abbreviation dictionary in Settings to add, edit or remove entries.
How to run it
Open the command palette (M-x in the Emacs keymap) and search for Abbreviations: Manage…, then press Enter. It has no default keybinding, but you can bind one in Settings → Keymaps.