That is the new standard for ddraw sizing.
You can wrap the message in lang with <size=10></size> tags to reduce it.
For example:
"flameturret.deployed": "<size=10>Flame Turret</size>",
"autoturret_deployed": "<size=10>Auto Turret</size>",
"spikes.floor": "<size=10>Floor Spikes</size>",
"teslacoil.deployed": "<size=10>Teslacoil</size>",
"beartrap": "<size=10>Bear Trap</size>",
"landmine": "<size=10>Landmine</size>",
"guntrap.deployed": "<size=10>Shotgun Trap</size>",
"Trap": "<size=10>Trap</size>",
"Container": "<size=10>Container</size>",