Describe the bug
A clear and concise description of what the bug is.
you can not change the word "Heat" to anything else
icon doesnt change either

To Reproduce
control:
hvac:
some_mode: false
another_mode: false
"off":
name: "Off"
icon: mdi:power
"on":
name: "Furnace On"
icon: mdi:power

Expected behavior
i should be able to change the word "HEAT" to "Furnace On" but you cant.. you can change "off:" but you cant change "on:"

# The least ammount of code possible to reproduce my error
type: 'custom:simple-thermostat'
entity: ...

Screenshots
Always include a screenshot

Browser

• OS: Mac/Win/iOS/Android
• Browser: Chrome/Firefox/Mobile app?
• Simple Thermostat version from browser console:
• Home Assistant version:
• All browsers on Windows and Ubuntu
• IE, Chrome,
• v2.5.0 of simple thermosate
• HA 2024.12.4