While FTEQW does have a launcher, if requires that you have Quake assets available locally. It won't launch the game without it, which means you either need the original game data of open assets such as LibreQuake.
-However, if you connect to the game server directly, odamex will download the required assets automatically from the server.
+However, if you connect to the game server directly, FTEQW will download the required assets automatically from the server.
From the terminal, type (on a single line):
fteqw-sdl2 +connect {{ site.content.play_domain_name }} +set com_gamename "" +set vid_fullscreen 2 +name "YourName"
Of course, substitute "YourName" with the in-game name you want.